How to get command Information in Linux ? 

Q: How to find out where the binary of a command I'm running?
A: You can use type command (available on both zsh and bash):

[]# type ls 
ls is an alias for ls -h --color=auto

[]# type cat 
cat is /bin/cat

[]# type alias 
alias is a shell builtin

Q : How to check command help ?
A: Following ways to check command help
# commandname --help
whatis commandname
man commandname

$ ls --help
$ whatis ls
$ man ls

Maintained By Amit Maheshwari