which command

Difference between which, whereis and whatis in Linux
you may have used which, whereis and whatis commands on linux several times. all three of these commands help you find information about other linux commands. these commands look similar, but they have some differences.
How to use the which command in Linux
the which command in linux determines the executable binary, which will execute when you issue a command to the shell. if you have different versions of the same program on your computer, you can use which to find out which shell will use.