[Home](./index.md) > [bitburner](./bitburner.md) > [NS](./bitburner.ns.md) > [fileExists](./bitburner.ns.fileexists.md) ## NS.fileExists() method 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. Signature: ```typescript fileExists(filename: string, host?: string): boolean; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | filename | string | Filename of file to check. | | host | string | Host 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: boolean True if specified file exists, and false otherwise. ## Remarks RAM cost: 0.1 GB ## Example 1 ```ts //The function call will return true if the script named foo.script exists on the foodnstuff server, and false otherwise. fileExists("foo.script", "foodnstuff"); ``` ## Example 2 ```ts //The function call will return true if the current server contains the FTPCrack.exe program, and false otherwise. fileExists("ftpcrack.exe"); ```