The Bourne-again shell is a Unix shell written for the GNU Project. Its ubiquity on Unix and Linux systems makes it a powerful tool for writing scripts to perform tedious actions (e.g. moving and modifying files).

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An environment variable can be localized to a single command if it's declaration is prepended to the command. For example,

$ CFLAGS="-Wall" make script

passes the moifier, -Wall, to the make command.

Additional resources

  1. Newham, Cameron and Bill Rosenblatt. Learning the bash Shell. 3rd ed. Cambridge: O'Reilly, 2005.