Getting help in Linux
For getting help in Linux you can user man command
Man: if short form of manuals, if you want help of any command run the command
man <command>
eg: man ls
it will open manual page and it will explain detailed and all available options for command.
Manual (man) pages are divided in 8 sections:
1 User Command
2 System Call
3 Library Call
4 Special File
5 File Format
6 Games
7 Miscellaneous
8 Administrator command
if you want to search about command or command config file man pages will be different as follows
for searching command
man 1 passwd
for check the config file
man 5 passwd
Apart from man there is another options to get quick help is another option is using –help
command –help
eg: ls –help
it will give short help of command
most helpful option for getting help is with option -k. where you can provide the keyword and it will look into all man pages and if keyword is found it will show details.
man -k mem