FreeBSD Porter's Handbook
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# 12.7 Use the `exec` Statement in Wrapper Scripts

If the port installs a shell script whose purpose is to launch another program, and if launching that program is the last action performed by the script, make sure to launch the program using the `exec` statement, for instance:

    #!/bin/sh
    exec %%LOCALBASE%%/bin/java -jar %%DATADIR%%/foo.jar "$@"

The `exec` statement replaces the shell process with the specified program. If `exec` is omitted, the shell process remains in memory while the program is executing, and needlessly consumes system resources.

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