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How do I make a shell file executable?

The command described below needs to be entered while logged in to the Unix server.   Normally you'll see a prompt ending with $ when the command interpreter (or shell) is ready for another command.


chmod   u+x   filename

(replace filename with the name of the shell file)

The file must of course contain executable code or statements.

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This is question number 232, which appears in the following categories:

Created by Andy Clews on 27 July 2001 and last updated by Andy Clews on 4 August 2015