Netscript Basic Functions¶

This page contains the complete documentation for all functions that are available in Netscript. This includes information such as function signatures, what they do, and their return values.

At the end is also a section that describes how to define your own functions in Netscript.

hack¶

hack(hostname/ip)

Arguments:	hostname/ip (string) -- IP or hostname of the target server to hack
Returns:	The amount of money stolen if the hack is successful, and zero otherwise

Function that is used to try and hack servers to steal money and gain hacking experience. The runtime for this command depends on your hacking level and the target server's security level. In order to hack a server you must first gain root access to that server and also have the required hacking level.

A script can hack a server from anywhere. It does not need to be running on the same server to hack that server. For example, you can create a script that hacks the 'foodnstuff' server and run that script on any server in the game.

A successful hack() on a server will raise that server's security level by 0.002.

Example:

hack("foodnstuff");
hack("10.1.2.3");

grow¶

grow(hostname/ip)

Arguments:	hostname/ip (string) -- IP or hostname of the target server to grow
Returns:	The number by which the money on the server was multiplied for the growth

Use your hacking skills to increase the amount of money available on a server. The runtime for this command depends on your hacking level and the target server's security level. When grow() completes, the money available on a target server will be increased by a certain, fixed percentage. This percentage is determined by the target server's growth rate (which varies between servers) and security level. Generally, higher-level servers have higher growth rates. The getServerGrowth() function can be used to obtain a server's growth rate.

Like hack(), grow() can be called on any server, regardless of where the script is running. The grow() command requires root access to the target server, but there is no required hacking level to run the command. It also raises the security level of the target server by 0.004.

Example:

grow("foodnstuff");

weaken¶

weaken(hostname/ip)

Arguments:	hostname.ip (string) -- IP or hostname of the target server to weaken
Returns:	The amount by which the target server's security level was decreased. This is equivalent to 0.05 multiplied by the number of script threads

Use your hacking skills to attack a server's security, lowering the server's security level. The runtime for this command depends on your hacking level and the target server's security level. This function lowers the security level of the target server by 0.05.

Like hack() and grow(), weaken() can be called on any server, regardless of where the script is running. This command requires root access to the target server, but there is no required hacking level to run the command.

Example:

weaken("foodnstuff");

sleep¶

sleep(n)

Arguments:	n (number) -- Number of milliseconds to sleep

Suspends the script for n milliseconds.

print¶

print(x)

Arguments:	x -- Value to be printed

Prints a value or a variable to the script's logs.

tprint¶

tprint(x)

Arguments:	x -- Value to be printed

Prints a value or a variable to the Terminal

clearLog¶

clearLog()¶: Clears the script's logs

disableLog¶

disableLog(fn)¶

Arguments:	fn (string) -- Name of function for which to disable logging

Disables logging for the given function. Logging can be disabled for all functions by passing 'ALL' as the argument.

Note that this does not completely remove all logging functionality. This only stops a function from logging when the function is successful. If the function fails, it will still log the reason for failure.

Notable functions that cannot have their logs disabled: run, exec, exit

enableLog¶

enableLog(fn)¶

Arguments:	fn (string) -- Name of function for which to enable logging

Re-enables logging for the given function. If 'ALL' is passed into this function as an argument, then it will revert the effects of disableLog('ALL')

scan¶

scan(hostname/ip[, hostnames=true])

Arguments:	hostname/ip (string) -- IP or hostname of the server to scan boolean -- Optional boolean specifying whether the function should output hostnames (if true) or IP addresses (if false)

Returns an array containing the hostnames or IPs of all servers that are one node way from the specified target server. The hostnames/IPs in the returned array are strings.

nuke¶

nuke(hostname/ip)

Arguments:	hostname/ip (string) -- IP or hostname of the target server

Runs the NUKE.exe program on the target server. NUKE.exe must exist on your home computer.

Example:

nuke("foodnstuff");

brutessh¶

brutessh(hostname/ip)

Arguments:	hostname/ip (string) -- IP or hostname of the target server

Runs the BruteSSH.exe program on the target server. BruteSSH.exe must exist on your home computer.

Example:

brutessh("foodnstuff");

ftpcrack¶

ftpcrack(hostname/ip)

Arguments:	hostname/ip (string) -- IP or hostname of the target server

Runs the FTPCrack.exe program on the target server. FTPCrack.exe must exist on your home computer.

Example:

ftpcrack("foodnstuff");

relaysmtp¶

relaysmtp(hostname/ip)

Arguments:	hostname/ip (string) -- IP or hostname of the target server

Runs the relaySMTP.exe program on the target server. relaySMTP.exe must exist on your home computer.

Example:

relaysmtp("foodnstuff");

httpworm¶

httpworm(hostname/ip)

Arguments:	hostname/ip (string) -- IP or hostname of the target server

Runs the HTTPWorm.exe program on the target server. HTTPWorm.exe must exist on your home computer.

Example:

httpworm("foodnstuff");

sqlinject¶

sqlinject(hostname/ip)

Arguments:	hostname/ip (string) -- IP or hostname of the target server

Runs the SQLInject.exe program on the target server. SQLInject.exe must exist on your home computer.

Example:

sqlinject("foodnstuff");

run¶

run(script[, numThreads=1][, args...])

Arguments:	script (string) -- Filename of script to run numThreads (number) -- Optional thread count for new script. Set to 1 by default. Will be rounded to nearest integer args... -- Additional arguments to pass into the new script that is being run. Note that if any arguments are being passed into the new script, then the second argument numThreads must be filled in with a value.

Run a script as a separate process. This function can only be used to run scripts located on the current server (the server running the script that calls this function).

Returns true if the script is successfully started, and false otherwise. Requires a significant amount of RAM to run this command.

The simplest way to use the run command is to call it with just the script name. The following example will run 'foo.script' single-threaded with no arguments:

run("foo.script");

The following example will run 'foo.script' but with 5 threads instead of single-threaded:

run("foo.script", 5);

This next example will run 'foo.script' single-threaded, and will pass the string 'foodnstuff' into the script as an argument:

run("foo.script", 1, 'foodnstuff');

exec¶

exec(script, hostname/ip[, numThreads=1][, args...])

Arguments:

Arguments:	script (string) -- Filename of script to execute hostname/ip (string) -- IP or hostname of the 'target server' on which to execute the script numThreads (number) -- Optional thread count for new script. Set to 1 by default. Will be rounded to nearest integer args... -- Additional arguments to pass into the new script that is being run. Note that if any arguments are being passed into the new script, then the third argument numThreads must be filled in with a value.

script (string) -- Filename of script to execute
hostname/ip (string) -- IP or hostname of the 'target server' on which to execute the script
numThreads (number) -- Optional thread count for new script. Set to 1 by default. Will be rounded to nearest integer
args... -- Additional arguments to pass into the new script that is being run. Note that if any arguments are being passed into the new script, then the third argument numThreads must be filled in with a value.

Run a script as a separate process on a specified server. This is similar to the run function except that it can be used to run a script on any server, instead of just the current server.

Returns true if the script is successfully started, and false otherwise.

The simplest way to use the exec command is to call it with just the script name and the target server. The following example will try to run generic-hack.script on the foodnstuff server:

exec("generic-hack.script", "foodnstuff");

The following example will try to run the script generic-hack.script on the joesguns server with 10 threads:

exec("generic-hack.script", "joesguns", 10);

This last example will try to run the script foo.script on the foodnstuff server with 5 threads. It will also pass the number 1 and the string "test" in as arguments to the script:

exec("foo.script", "foodnstuff", 5, 1, "test");

spawn¶

spawn(script, numThreads[, args...])

Arguments:	script (string) -- Filename of script to execute numThreads (number) -- Number of threads to spawn new script with. Will be rounded to nearest integer args... -- Additional arguments to pass into the new script that is being run.

Terminates the current script, and then after a delay of about 20 seconds it will execute the newly-specified script. The purpose of this function is to execute a new script without being constrained by the RAM usage of the current one. This function can only be used to run scripts on the local server.

Because this function immediately terminates the script, it does not have a return value.

The following example will execute the script 'foo.script' with 10 threads and the arguments 'foodnstuff' and 90:

spawn('foo.script', 10, 'foodnstuff', 90);

kill¶

kill(script, hostname/ip[, args...])

Arguments:	script (string) -- Filename of the script to kill hostname/ip (string) -- IP or hostname of the server on which to kill the script args... -- Arguments to identify which script to kill

Kills the script on the target server specified by the script's name and arguments. Remember that scripts are uniquely identified by both their name and arguments. For example, if foo.script is run with the argument 1, then this is not the same as foo.script run with the argument 2, even though they have the same code.

If this function successfully kills the specified script, then it will return true. Otherwise, it will return false.

Examples:

The following example will try to kill a script named foo.script on the foodnstuff server that was ran with no arguments:

kill("foo.script", "foodnstuff");

The following will try to kill a script named foo.script on the current server that was ran with no arguments:

kill("foo.script", getHostname());

The following will try to kill a script named foo.script on the current server that was ran with the arguments 1 and "foodnstuff":

kill("foo.script", getHostname(), 1, "foodnstuff");

killall¶

killall(hostname/ip)

Arguments:	hostname/ip (string) -- IP or hostname of the server on which to kill all scripts

Kills all running scripts on the specified server. This function returns true if any scripts were killed, and false otherwise. In other words, it will return true if there are any scripts running on the target server.

exit¶

exit(): Terminates the current script immediately

scp¶

scp(files, [source, ]destination)

Arguments:

Arguments:	files (string/array) -- Filename or an array of filenames of script/literature files to copy source (string) -- Hostname or IP of the source server, which is the server from which the file will be copied. This argument is optional and if it's omitted the source will be the current server. destination (string) -- Hostname or IP of the destination server, which is the server to which the file will be copied.

files (string/array) -- Filename or an array of filenames of script/literature files to copy
source (string) -- Hostname or IP of the source server, which is the server from which the file will be copied. This argument is optional and if it's omitted the source will be the current server.
destination (string) -- Hostname or IP of the destination server, which is the server to which the file will be copied.

Copies a script or literature (.lit) file(s) to another server. The files argument can be either a string specifying a single file to copy, or an array of strings specifying multiple files to copy.

Returns true if the script/literature file is successfully copied over and false otherwise. If the files argument is an array then this function will return true if at least one of the files in the array is successfully copied.

Examples:

//Copies hack-template.script from the current server to foodnstuff
scp("hack-template.script", "foodnstuff");

//Copies foo.lit from the helios server to the home computer
scp("foo.lit", "helios", "home");

//Tries to copy three files from rothman-uni to home computer
files = ["foo1.lit", "foo2.script", "foo3.script"];
scp(files, "rothman-uni", "home");

ls¶

ls(hostname/ip[, grep])

Arguments:	hostname/ip (string) -- Hostname or IP of the target server grep (string) -- a substring to search for in the filename

Returns an array with the filenames of all files on the specified server (as strings). The returned array is sorted in alphabetic order

hasRootAccess¶

hasRootAccess(hostname/ip)¶

Arguments:	hostname/ip (string) -- Hostname or IP of the target server

Returns a boolean indicating whether or not the player has root access to the specified target server.

Example:

if (hasRootAccess("foodnstuff") == false) {
    nuke("foodnstuff");
}

getHostname¶

getHostname()¶: Returns a string with the hostname of the server that the script is running on

getHackingLevel¶

getHackingLevel()¶: Returns the player's current hacking level

getHackingMultipliers¶

getHackingMultipliers()¶

Returns an object containing the Player's hacking related multipliers. These multipliers are returned in integer forms, not percentages (e.g. 1.5 instead of 150%). The object has the following structure:

{
    chance: Player's hacking chance multiplier,
    speed: Player's hacking speed multiplier,
    money: Player's hacking money stolen multiplier,
    growth: Player's hacking growth multiplier
}

Example of how this can be used:

mults = getHackingMultipliers();
print(mults.chance);
print(mults.growth);

getServerMoneyAvailable¶

getServerMoneyAvailable(hostname/ip)¶

Arguments:	hostname/ip (string) -- Hostname or IP of target server

Returns the amount of money available on a server. Running this function on the home computer will return the player's money.

Example:

getServerMoneyAvailable("foodnstuff");
getServerMoneyAvailable("home"); //Returns player's money

getServerMaxMoney¶

getServerMaxMoney(hostname/ip)¶

Arguments:	hostname/ip (string) -- Hostname or IP of target server

Returns the maximum amount of money that can be available on a server

getServerGrowth¶

getServerGrowth(hostname/ip)¶

Arguments:	hostname/ip (string) -- Hostname or IP of target server

Returns the server's instrinsic "growth parameter". This growth parameter is a number between 1 and 100 that represents how quickly the server's money grows. This parameter affects the percentage by which the server's money is increased when using the grow() function. A higher growth parameter will result in a higher percentage increase from grow().

getServerSecurityLevel¶

getServerSecurityLevel(hostname/ip)¶

Arguments:	hostname/ip (string) -- Hostname or IP of target server

Returns the security level of the target server. A server's security level is denoted by a number, typically between 1 and 100 (but it can go above 100).

getServerBaseSecurityLevel¶

getServerBaseSecurityLevel(hostname/ip)¶

Arguments:	hostname/ip (string) -- Hostname or IP of target server

Returns the base security level of the target server. This is the security level that the server starts out with. This is different than getServerSecurityLevel() because getServerSecurityLevel() returns the current security level of a server, which can constantly change due to hack(), grow(), and weaken(), calls on that server. The base security level will stay the same until you reset by installing an Augmentation(s).

getServerMinSecurityLevel¶

getServerMinSecurityLevel(hostname/ip)¶

Arguments:	hostname/ip (string) -- Hostname or IP of target server

Returns the minimum security level of the target server

getServerRequiredHackingLevel¶

getServerRequiredHackingLevel(hostname/ip)¶

Arguments:	hostname/ip (string) -- Hostname or IP of target server

Returns the required hacking level of the target server

getServerNumPortsRequired¶

getServerNumPortsRequired(hostname/ip)¶

Arguments:	hostname/ip (string) -- Hostname or IP of target server

Returns the number of open ports required to successfully run NUKE.exe on the specified server.

getServerRam¶

getServerRam(hostname/ip)¶

Arguments:	hostname/ip (string) -- Hostname or IP of target server

Returns an array with two elements that gives information about a server's memory (RAM). The first element in the array is the amount of RAM that the server has total (in GB). The second element in the array is the amount of RAM that is currently being used on the server (in GB).

Example:

res = getServerRam("helios");
totalRam = res[0];
ramUsed = res[1];

serverExists¶

serverExists(hostname/ip)¶

Arguments:	hostname/ip (string) -- Hostname or IP of target server

Returns a boolean denoting whether or not the specified server exists

fileExists¶

fileExists(filename[, hostname/ip])¶

Arguments:	filename (string) -- Filename of file to check hostname/ip (string) -- Hostname or IP of target server. This is optional. If it is not specified then the function will use the current server as the target server

Returns a boolean indicating whether the specified file exists on the target server. The filename for scripts is case-sensitive, but for other types of files it is not. For example, fileExists("brutessh.exe") will work fine, even though the actual program is named "BruteSSH.exe".

If the hostname/ip argument is omitted, then the function will search through the current server (the server running the script that calls this function) for the file.

Examples:

fileExists("foo.script", "foodnstuff");
fileExists("ftpcrack.exe");

The first example above will return true if the script named foo.script exists on the foodnstuff server, and false otherwise. The second example above will return true if the current server contains the FTPCrack.exe program, and false otherwise.

isRunning¶

isRunning(filename, hostname/ip[, args...])¶

Arguments:	filename (string) -- Filename of script to check. This is case-sensitive. hostname/ip (string) -- Hostname or IP of target server args... -- Arguments to specify/identify which scripts to search for

Returns a boolean indicating whether the specified script is running on the target server. Remember that a script is uniquely identified by both its name and its arguments.

Examples:

In this first example below, the function call will return true if there is a script named foo.script with no arguments running on the foodnstuff server, and false otherwise:

isRunning("foo.script", "foodnstuff");

In this second example below, the function call will return true if there is a script named foo.script with no arguments running on the current server, and false otherwise:

isRunning("foo.script", getHostname());

In this next example below, the function call will return true if there is a script named foo.script running with the arguments 1, 5, and "test" (in that order) on the joesguns server, and false otherwise:

isRunning("foo.script", "joesguns", 1, 5, "test");

getNextHacknetNodeCost¶

getNextHacknetNodeCost()¶: Returns the cost of purchasing a new Hacknet Node

purchaseHacknetNode¶

purchaseHacknetNode()¶: Purchases a new Hacknet Node. Returns a number with the index of the Hacknet Node. This index is equivalent to the number at the end of the Hacknet Node's name (e.g The Hacknet Node named 'hacknet-node-4' will have an index of 4). If the player cannot afford to purchase a new Hacknet Node then the function will return false.

purchaseServer¶

purchaseServer(hostname, ram)¶

Arguments:	hostname (string) -- Hostname of the purchased server ram (number) -- Amount of RAM of the purchased server. Must be a power of 2 (2, 4, 8, 16, etc.)

Purchased a server with the specified hostname and amount of RAM.

The hostname argument can be any data type, but it will be converted to a string and have whitespace removed. Anything that resolves to an empty string will cause the function to fail. If there is already a server with the specified hostname, then the function will automatically append a number at the end of the hostname argument value until it finds a unique hostname. For example, if the script calls purchaseServer("foo", 4) but a server named "foo" already exists, the it will automatically change the hostname to "foo-0". If there is already a server with the hostname "foo-0", then it will change the hostname to "foo-1", and so on.

Note that there is a maximum limit to the amount of servers you can purchase.

Returns the hostname of the newly purchased server as a string. If the function fails to purchase a server, then it will return an empty string. The function will fail if the arguments passed in are invalid, if the player does not have enough money to purchase the specified server, or if the player has exceeded the maximum amount of servers.

Example:

ram = 64;
hn = "pserv-";
for (i = 0; i < 5; ++i) {
    purchaseServer(hn + i, ram);
}

deleteServer¶

deleteServer(hostname)¶

Arguments:	hostname (string) -- Hostname of the server to delete

Deletes one of your purchased servers, which is specified by its hostname.

The hostname argument can be any data type, but it will be converted to a string. Whitespace is automatically removed from the string. This function will not delete a server that still has scripts running on it.

Returns true if successful, and false otherwise.

getPurchasedServers¶

getPurchasedServers([hostname=true])¶

Arguments:	hostname (boolean) -- Specifies whether hostnames or IP addresses should be returned. If it's true then hostnames will be returned, and if false then IPs will be returned. If this argument is omitted then it is true by default

Returns an array with either the hostnames or IPs of all of the servers you have purchased.

write¶

write(port/fn, data="", mode="a")

Arguments:	port/fn (string/number) -- Port or text file that will be written to data (string) -- Data to write mode (string) -- Defines the write mode. Only valid when writing to text files.

This function can be used to either write data to a port or to a text file (.txt).

If the first argument is a number between 1 and 10, then it specifies a port and this function will write data to that port. Read about how Netscript Ports work here. The third argument, mode, is not used when writing to a port.

If the first argument is a string, then it specifies the name of a text file (.txt) and this function will write data to that text file. If the specified text file does not exist, then it will be created. The third argument mode, defines how the data will be written to the text file. If *mode is set to "w", then the data is written in "write" mode which means that it will overwrite all existing data on the text file. If mode is set to any other value then the data will be written in "append" mode which means that the data will be added at the end of the text file.

read¶

read(port/fn)

Arguments:	port/fn (string/number) -- Port or text file to read from

This function is used to read data from a port or from a text file (.txt).

If the argument port/fn is a number between 1 and 10, then it specifies a port and it will read data from that port. Read about how Netscript Ports work here. A port is a serialized queue. This function will remove the first element from that queue and return it. If the queue is empty, then the string "NULL PORT DATA" will be returned.

If the argument port/fn is a string, then it specifies the name of a text file (.txt) and this function will return the data in the specified text file. If the text file does not exist, an empty string will be returned.

peek¶

peek(port)

Arguments:	port (number) -- Port to peek. Must be an integer between 1 and 10

This function is used to peek at the data from a port. It returns the first element in the specified port without removing that element. If the port is empty, the string "NULL PORT DATA" will be returned.

Read about how Netscript Ports work here.

clear¶

clear(port/fn)

Arguments:	port/fn (string/number) -- Port or text file to clear

This function is used to clear data in a Netscript Ports or a text file.

If the port/fn argument is a number between 1 and 10, then it specifies a port and will clear it (deleting all data from the underlying queue).

If the port/fn argument is a string, then it specifies the name of a text file (.txt) and will delete all data from that text file.

rm¶

rm(fn)

Arguments:	fn (string) -- Filename of file to remove. Must include the extension
Returns:	True if it successfully deletes the file, and false otherwise

Removes the specified file from the current server. This function works for every file type except message (.msg) files.

scriptRunning¶

scriptRunning(scriptname, hostname/ip)¶

Arguments:	scriptname (string) -- Filename of script to check. This is case-sensitive. hostname/ip (string) -- Hostname or IP of target server

Returns a boolean indicating whether any instance of the specified script is running on the target server, regardless of its arguments.

This is different than the isRunning() function because it does not try to identify a specific instance of a running script by its arguments.

Examples:

The example below will return true if there is any script named foo.script running on the foodnstuff server, and false otherwise:

scriptRunning("foo.script", "foodnstuff");

The example below will return true if there is any script named "foo.script" running on the current server, and false otherwise:

scriptRunning("foo.script", getHostname());

scriptKill¶

scriptKill(scriptname, hostname/ip)¶

Arguments:	scriptname (string) -- Filename of script to kill. This is case-sensitive. hostname/ip (string) -- Hostname or IP of target server

Kills all scripts with the specified filename on the target server specified by hostname/ip, regardless of arguments. Returns true if one or more scripts were successfully killed, and false if none were.

getScriptRam¶

getScriptRam(scriptname, hostname/ip)¶

Arguments:	scriptname (string) -- Filename of script. This is case-sensitive. hostname/ip (string) -- Hostname or IP of target server

Returns the amount of RAM required to run the specified script on the target server

getHackTime¶

getHackTime(hostname/ip)¶

Arguments:	hostname/ip (string) -- Hostname or IP of target server

Returns the amount of time in seconds it takes to execute the hack() Netscript function on the target server.

getGrowTime¶

getGrowTime(hostname/ip)¶

Arguments:	hostname/ip (string) -- Hostname or IP of target server

Returns the amount of time in seconds it takes to execute the grow() Netscript function on the target server.

getWeakenTime¶

getWeakenTime(hostname/ip)¶

Arguments:	hostname/ip (string) -- Hostname or IP of target server

Returns the amount of time in seconds it takes to execute the weaken() Netscript function on the target server.

getScriptIncome¶

getScriptIncome([scriptname][, hostname/ip][, args...])¶

Arguments:	scriptname (string) -- Filename of script hostname/ip (string) -- Server on which script is running args... -- Arguments that the script is running with

Returns the amount of income the specified script generates while online (when the game is open, does not apply for offline income). Remember that a script is uniquely identified by both its name and its arguments. So for example if you ran a script with the arguments "foodnstuff" and "5" then in order to use this function to get that script's income you must specify those same arguments in the same order in this function call.

This function can also be called with no arguments. If called with no arguments, then this function will return an array of two values. The first value is the total income ($ / second) of all of your active scripts (scripts that are currently running on any server). The second value is the total income ($ / second) that you've earned from scripts since you last installed Augmentations.

getScriptExpGain¶

getScriptExpGain([scriptname][, hostname/ip][, args...])¶

Arguments:	scriptname (string) -- Filename of script hostname/ip (string) -- Server on which script is running args... -- Arguments that the script is running with

Returns the amount of hacking experience the specified script generates while online (when the game is open, does not apply for offline experience gains). Remember that a script is uniquely identified by both its name and its arguments.

This function can also return the total experience gain rate of all of your active scripts by running the function with no arguments.

getTimeSinceLastAug¶

getTimeSinceLastAug()¶: Returns the amount of time in milliseconds that have passed since you last installed Augmentations

sprintf¶

sprintf(): See this link for details.

vsprintf¶

vsprintf(): See this link for details.

prompt¶

prompt(txt)

Arguments:	txt (string) -- Text to appear in the prompt dialog box

Prompts the player with a dialog box with two options: "Yes" and "No". This function will return true if the player click "Yes" and false if the player clicks "No". The script's execution is halted until the player selects one of the options.

Defining your own Functions¶

You can define your own functions in Netscript using the following syntax:

function name(args...) {
    function code here...
    return some_value
}

Functions should have some return value. Here is an example of defining and using a function:

function sum(values) {
    res = 0;
    for (i = 0; i < values.length; ++i) {
        res += values[i];
    }
    return res;
}

print(sum([1, 2, 3, 4, 5]));    //Prints 15
print(sum([1, 10]));            //Prints 11

For those with experience in other languages, especially Javascript, it may be important to note that function declarations are not hoisted and must be declared BEFORE you use them. For example, the following will cause an error saying variable hello not defined:

print(hello());

function hello() {
    return "world";
}

The following will work fine:

function hello() {
    return "world";
}

print(hello());     //Prints out "world"

Note about variable scope in functions:

Functions can access "global" variables declared outside of the function's scope. However, they cannot change the value of any "global" variables. Any changes to "global" variables will only be applied locally to the function.

The following example shows that any change to a "global" variable from inside a function only applies in the function's local scope:

function foo() {
    i = 5;
    return "foo";
}

i = 0;
print(i);   //Prints 0
foo();
print(i);   //Prints 0

Furthermore, this also means that any variable that is first defined inside a function will NOT be accessible outside of the function as shown in the following example:

function sum(values) {
    res = 0;
    for (i = 0; i < values.length; ++i) {
        res += values[i];
    }
    return res;
}
print(res);

results in the following runtime error:

Script runtime error:
Server Ip: 75.7.4.1
Script name: test.script
Args:[]
variable res not defined

Other Notes about creating your own functions:

Defining a function does not create a Javascript function object in the underlying game code. This means that you cannot use any function you create in functions such as Array.sort() (not yet at least, I'll try to make it work in the future).

Netscript Basic Functions¶

hack¶

grow¶

weaken¶

sleep¶

print¶

tprint¶

clearLog¶

disableLog¶

enableLog¶

scan¶

nuke¶

brutessh¶

ftpcrack¶

relaysmtp¶

httpworm¶

sqlinject¶

run¶

exec¶

spawn¶

kill¶

killall¶

exit¶

scp¶

ls¶

hasRootAccess¶

getHostname¶

getHackingLevel¶

getHackingMultipliers¶

getServerMoneyAvailable¶

getServerMaxMoney¶

getServerGrowth¶

getServerSecurityLevel¶

getServerBaseSecurityLevel¶

getServerMinSecurityLevel¶

getServerRequiredHackingLevel¶

getServerNumPortsRequired¶

getServerRam¶

serverExists¶

fileExists¶

isRunning¶

getNextHacknetNodeCost¶

purchaseHacknetNode¶

purchaseServer¶

deleteServer¶

getPurchasedServers¶

write¶

read¶

peek¶

clear¶

rm¶

scriptRunning¶

scriptKill¶

getScriptRam¶

getHackTime¶

getGrowTime¶

getWeakenTime¶

getScriptIncome¶

getScriptExpGain¶

getTimeSinceLastAug¶

sprintf¶

vsprintf¶

prompt¶

Defining your own Functions¶

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