display the online help. cmd.exe Used without parameters, help lists and briefly describes every system command. Windows NT-based versions use MS-DOS 5 style help. Versions before Windows Vista also have a Windows help file (NTCMDS.HLP or NTCMDS.INF) in a similar style to MS-DOS 6. PowerShell In PowerShell, help is a short form (implemented as a PowerShell function) for access to the Get-Help Cmdlet. Windows PowerShell includes an extensive, console-based help system, reminiscent of man pages in Unix. The help topics include help for cmdlets, providers, and concepts in PowerShell. GNU Bash In Bash, the builtin command help' lists all Bash builtin commands if used without arguments. Otherwise, it prints a brief summary of a command. Its syntax is: help [-dms] [pattern] OpenVMS HELP is a DCL utility that contains information on the use of commands and descriptions of some OpenVMS concepts such as time formats and lexical functions, as well as lists of commands for a particular purpose (HELP Hints). Syntax The command-syntax is: help [command] Arguments: command This command-line argument specifies the name of the command about which information is to be displayed. Examples DOSBox Z:\>help If you want a list of all supported commands type help /all . A short list of the most often used commands: <DIR > Directory View. <CD > Display/changes the current directory. <CLS > Clear screen. <COPY > Copy files. ... Python >>> help Type help() for interactive help, or help(object) for help about object. >>> help() Welcome to Python 2.5! This is the online help utility. If this is your first time using Python, you should definitely check out the tutorial on the Internet at https://www.python.org/doc/tut/. Enter the name of any module, keyword, or topic to get help on writing Python programs and using Python modules. To quit this help utility and return to the interpreter, just type "quit". ... GNU Octave octave-3.0.0.exe:1> help Help is available for the topics listed below. Additional help for built-in functions and operators is available in the on-line version of the manual. Use the command `doc <topic>' to search the manual index. ... See also Online help List of DOS commands References Further reading External links help | Microsoft Docs Multics commands External DOS commands MSX-DOS commands OS/2 commands ReactOS commands Windows commands IBM i Qshell commands Microcomputer software Windows administration Technical communication Online help