You can use "type" or "whereis" command to find out which command shell executes and to print binary (command) file location for specified command.
whereis command example
Display ls command location along with man page path:whereis ls
Output:
ls: /bin/ls /usr/share/man/man1p/ls.1p.gz /usr/share/man/man1/ls.1.gz
type command example
Find out which command the shell executes:type -a ls
Output:
ls is aliased to `ls --color=tty'
ls is /bin/ls
Source: http://www.cyberciti.biz/tips/find-linux-unix-command-location.html
