Executables and Scripts

We have several kinds of executable commands; those that are built into the bash shell, executables that are binary program files, and scripts that are interpreted by another program, like bash or perl or python.

While Windows determines what a file is by its extension, Linux examines the first few bytes of the file itself. The file extension is less important than in Windows. Here is a tool to determine what a particular file actually is:

ubuntu@ubuntu:~/Desktop/examples$ file $d/defoma ubuntu@ubuntu:~/Desktop/examples$ file $d/du ubuntu@ubuntu:~/Desktop/examples$ file $d/nroff ubuntu@ubuntu:~/Desktop/examples$ file $d/pydoc2.4



Of particular interest are those that are bash (or Bourne shell) scripts.
If you place a series of bash command lines in a file, and make that file
executable, you have made a shell script. See the menu on the upper
left that says Shell Scripts.




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