Getting Help in Linux
There are various methods for getting help in Linux.
For Graphical environment using yelp we can saw these three
man pages.
1 GNU Info notes
2 GNOME graphical documentation
3 Linux System Manual (Man Pages)
Yelp is the Gnome help/documentation browser. It is designed
to help you browse all the documentation on your system in one central tool.
Command line help:
-h or –-help
If you are not sure how to use the command use –h option
after the command. It will show about the command and the different option
available for the command.
$ ls -- help
Man command gives the detailed information about the
command. You can say man command shows the documentation page of command. It has
all the information but in starting you can find a little bit difficult to
understand .
$ man ls
Linux manual is divided into sections. Each section man page
is relevant to a particular type of information.
There are 9 sections
|
Section
|
Description
|
|
1
|
General commands
|
|
2
|
System calls
|
|
3
|
Library functions,
covering in particular the C standard library
|
|
4
|
Special files (usually
devices, those found in /dev) and drivers
|
|
5
|
File formats and
conventions
|
|
6
|
Games and screensavers
|
|
7
|
Miscellanea
|
|
8
|
System administration
commands and daemons
|
|
9
|
Linux kernel API
|
Info
When you are not able to find the required information from the
Linux man page, try the info documents using the Linux info command.
$ info sed
apropos
The apropos command searches for man pages that contain a
phrase, so it’s a quick way of finding a command that can do something. It’s
the same thing as running the man -k command.
apropos searches a set of database files containing short
descriptions of system commands for keywords and displays the result on the
standard output.
$ apropos grep
bzegrep [bzgrep]
(1) - search possibly bzip2
compressed files for a regular expression
bzfgrep [bzgrep]
(1) - search possibly bzip2
compressed files for a regular expression
bzgrep
(1) - search possibly bzip2
compressed files for a regular expression
egrep [grep]
(1) - print lines matching a
pattern
fgrep [grep]
(1) - print lines matching a
pattern
grep
(1) - print lines matching a
pattern
grepdiff
(1) - show files modified by a
diff containing a regex
Whatis
It shows a short description about the command.
$ whatis top
top
(1) - display Linux tasks
batch and at commands File Permissions in Linux
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