[Home](./index.md) > [bitburner](./bitburner.md) > [NS](./bitburner.ns.md) > [ls](./bitburner.ns.ls.md) ## NS.ls() method List files on a server. **Signature:** ```typescript ls(host: string, substring?: string): string[]; ``` ## Parameters

Parameter	Type	Description
host	string	Hostname/IP of the target server.
substring	string	_(Optional)_ A substring to search for in the filename.

**Returns:** string\[\] Array with the filenames of all files on the specified server. ## Remarks RAM cost: 0.2 GB Returns an array with the filenames of all files on the specified server (as strings). The returned array is sorted in alphabetic order.