How to Get Help From Linux Command Line and Man Pages - RHCSA

Getting Help From Command Line



:: Getting Help From Command Line ::

Not most of the production Server will have access to internet, because of security reasons, wihtout internet access how you can get an help using your command line interface. which is not a step by step guide but it will give you an idea to execute the commands and how commands works.

In Order to get the help, we have to use below commands in most of the situations.

1. Man
2. Pinfo
3. Command --help
4. Info
5. Help command

Man is the system's manual pager. Each page arugument given to man is normally the name of program, utility or function.

1 Executable programs or shell commands
2 System calls (functions provided by the kernel)
3 Library calls (functions within program libraries)
4 Special files (usually found in /dev)
5 File formats and conventions eg /etc/passwd
6 Games
7 Miscellaneous (including macro packages and conventions), e.g. man(7), groff(7)
8 System administration commands (usually only for root)
9 Kernel routines [Non standard]

man ls

man -a intro

man -t alias | lpr -Pps

man -k printf

man -s 3 -K "open"

Spacebar – Scrolling man page down

PageDown/Down Arrow – Scrolling man page down

PageUp/Up Arrow – Scrolling man page UP

/string – Search for particular string

n (key) – Repeat search Up to down

N (key) – Repeat search Down to up

g – Go to first to man page

G  – Go to end of the man page

q – Exit from man page

pinfo

info

Whereis

whatis

command --help

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