type - Indicate how a command name is interpreted.
1. An executable program- like all those files we saw in /usr/bin.
date, cal, df, free, file, less, cp, mkdir, rm, ln, which, man, cat, nano, vi, ping, rmdir, su, sudo, pager, find, grep, gzip, bzip2, xz, ps, clear, apt-get, tar
-->total 29 commands.
2. A command built into the shell itself - "shell builtins".
