bitburner-src/markdown/bitburner.ns.fileexists.md

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## NS.fileExists() method

Check if a file exists.

**Signature:**

```typescript
fileExists(filename: string, host?: string): boolean;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  filename | string | Filename of file to check. |
|  host | string | _(Optional)_ Host of target server. This is optional. If it is not specified then the function will use the current server as the target server. |

**Returns:**

boolean

True if specified file exists, and false otherwise.

## Remarks

RAM cost: 0.1 GB

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.

## Example 1


```ts
// NS1:
//The function call will return true if the script named foo.script exists on the foodnstuff server, and false otherwise.
fileExists("foo.script", "foodnstuff");

//The function call will return true if the current server contains the FTPCrack.exe program, and false otherwise.
fileExists("ftpcrack.exe");
```
\*

## Example 2


```ts
// NS2:
// The function call will return true if the script named foo.script exists on the foodnstuff server, and false otherwise.
ns.fileExists("foo.script", "foodnstuff");

// The function call will return true if the current server contains the FTPCrack.exe program, and false otherwise.
ns.fileExists("ftpcrack.exe");
```