<tt>$0</tt>: The Name of the Invoking Command


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$0: The Name of the Invoking Command

The special variable $0 represents the name of the executing program. The following shell, if called script.sh would output This program is called script.sh.: 

    #!/bin/sh
    echo This program is called $0.
    exit 0


Super-User
Fri Feb 17 15:55:40 EST 1995