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[Home](./index.md) &gt; [bitburner](./bitburner.md) &gt; [NS](./bitburner.ns.md) &gt; [isRunning](./bitburner.ns.isrunning.md)

## NS.isRunning() method

Check if a script is running.

**Signature:**

```typescript
isRunning(script: FilenameOrPID, host?: string, ...args: (string | number | boolean)[]): boolean;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  script | [FilenameOrPID](./bitburner.filenameorpid.md) | Filename or PID of script to check. This is case-sensitive. |
|  host | string | _(Optional)_ Hostname of target server. |
|  args | (string \| number \| boolean)\[\] | Arguments to specify/identify which scripts to search for. |

**Returns:**

boolean

True if the specified script is running on the target server, and false otherwise.

## Remarks

RAM cost: 0.1 GB

Returns a boolean indicating whether the specified script is running on the target server. If you use a PID instead of a filename, the hostname and args parameters are unnecessary. Remember that a script is uniquely identified by both its name and its arguments.

## Example


```js
//The function call will return true if there is a script named foo.js with no arguments running on the foodnstuff server, and false otherwise:
ns.isRunning("foo.js", "foodnstuff");

//The function call will return true if there is a script named foo.js with no arguments running on the current server, and false otherwise:
ns.isRunning("foo.js", ns.getHostname());

//The function call will return true if there is a script named foo.js running with the arguments 1, 5, and “test” (in that order) on the joesguns server, and false otherwise:
ns.isRunning("foo.js", "joesguns", 1, 5, "test");
```