Help (command)

In computing, codice_1 is a command in various command line shells such as codice_2, codice_3, Bash, qshell, 4DOS/4NT, Windows PowerShell, Singularity shell, Python, MATLAB and GNU Octave. It provides online information about available commands and the shell environment.
Implementations.
The command is available in operating systems such as Multics, Heath Company HDOS, DOS, IBM OS/2, eComStation, ArcaOS, IBM i, Microsoft Windows, ReactOS, THEOS/OASIS, Zilog Z80-RIO, Microware OS-9, Stratus OpenVOS, HP MPE/iX, Motorola VERSAdos, KolibriOS and also in the DEC RT-11, RSX-11, TOPS-10 and TOPS-20 operating systems. Furthermore it is available in the open source MS-DOS emulator DOSBox and in the EFI shell. 
On Unix, the command is part of the Source Code Control System and prints help information for the SCCS commands.
Multics.
The Multics codice_1 command prints descriptions of system commands/active functions and subroutines. It also prints various information about the system status, system changes, and other general information. This information is selected from segments maintained online, which are in a special format, called information segments. More than 800 information segments are available.
DEC OS/8.
The DEC OS/8 CCL codice_1 command prints information on specified OS/8 programs.
DOS.
MS-DOS.
The codice_1 command is available in MS-DOS 5.x and later versions of the software.
The codice_1 command with a 'command' parameter would give help on a specific command.
If no arguments are provided, the command lists the contents of codice_8.
In MS-DOS 6.x this command exists as codice_9.
The MS-DOS 6.xx codice_1 command uses QBasic to view a quickhelp codice_11 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.
In PC DOS 5 and 6 codice_1 is the same form as MS-DOS 5 codice_1 command.
PC DOS 7.xx codice_1 uses codice_15 to open OS/2 style INF files (codice_16, codice_17 and codice_18), opening these to the appropriate pages.
PC-MOS.
The Software Link's PC-MOS includes an implementation of codice_1. Like the rest of the operating system, it is licensed under the GPL v3. 
DR-DOS.
In DR-DOS, codice_1 is a batch file that launches DR-DOS' internal help program, codice_21.
ROM-DOS.
Datalight ROM-DOS includes an implementation of the command. ROM-DOS was introduced in 1989 as an MS-DOS compatible operating system designed for embedded systems.
FreeDOS.
The FreeDOS version was developed by Joe Cosentino.
4DOS/4NT.
The 4DOS/4NT codice_1 command uses a text user interface to display the online help.
cmd.exe.
Used without parameters, codice_1 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 (codice_24 or codice_25) in a similar style to MS-DOS 6.
PowerShell.
In PowerShell, codice_1 is a short form (implemented as a PowerShell function) for access to the codice_27 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 codice_1' lists all Bash builtin commands if used without arguments. Otherwise, it prints a brief summary of a command. Its syntax is:
 help [-dms] [pattern]
Syntax.
The command-syntax is:
 help [command]
Arguments:
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.
 Main article: Docstring
»> 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.