How do i find all the places a command is used on redhat?

amurleopard

A command may be aliased, scripted or a binary.

Where is ls defined in PATH, function or alias? Here it's just the PATH

$ type -a ls
ls is /bin/ls

Let's define an alias.

$ alias ls='ls -ltr'

Check with the type command again. Now it's an alias and in the PATH. The alias is referenced first.

$ type -a ls
ls is aliased to `ls -ltr'
ls is /bin/ls