Running a shell program on Mac OS X

Save exio.command on your computer.
Then just double click it in the finder.
It will open the terminal application (a shell) and run it. 

Note: Mac OS X runs on BSD Unix.
  The terminal command allows you to do thing directly in UNIX.

Shell is an interpreted command line scripting program.  There are several versions.
Bash is the Bourne Again SHell from the GNU project. Bash is an sh-compatible
 shell that incorporates useful features from the Korn shell (ksh) and C shell (csh). 

Links:
Search for shell

last updated 4 Mar 2016