help (command)

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In computing, help is a command in various command line shells such as COMMAND.COM, cmd.exe, 4DOS/4NT, Windows PowerShell, Python and GNU Octave. It provides online information about available commands and the shell environment. It is analogous to the Unix man command.

[edit] Syntax

help [command]

Arguments:

• command This command-line argument specifies the name of the command about which information is to be displayed.

[edit] Implementations

[edit] DOS

The help command is available in MS-DOS 5.x and later. If no arguments are provided, the command lists the contents of DOSHELP.HLP. In MS-DOS 6.x this command exists as FASTHELP.

• The MS-DOS 6.xx help command uses QBasic to view a quickhelp HELP.HLP file, which contains more extensive information on the commands, with some hyperlinking etc. The MS-DOS 6.22 help system is included on Windows 9x CD-ROM versions as well.
• PC-DOS 7.xx help uses view.exe to open OS/2 style INF files (cmdref.inf, dosrexx.inf and doserror.inf), opening these to the appropriate pages.

[edit] 4DOS/4NT

The 4DOS/4NT help command uses a Text user interface to display the online help.

[edit] 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.

[edit] Windows PowerShell

In Windows PowerShell, help is a short form of the Get-Help Cmdlet. The internal name is Microsoft.PowerShell.Core\Get-Help.

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.

[edit] Examples

[edit] DOSBox

Z:\help
If you want a list of all supported commadns type help /all .
A short list of the most often used commands:
<CD      > Display/changes the current directory.
<CLS     > Clear screen.
<COPY    > Copy files.
<DIR     > Directory View.
...

[edit] 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 http://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".
...

[edit] 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.
...

[edit] See also

• Online help
• List of DOS commands

[edit] References

• Microsoft TechNet Help article

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