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   set.1p    ( 1 )

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Использование в приложениях (Application usage)

Application writers should avoid relying on set -e within
       functions. For example, in the following script:

           set -e
           start() {
               some_server
               echo some_server started successfully
           }
           start || echo >&2 some_server failed

       the -e setting is ignored within the function body (because the
       function is a command in an AND-OR list other than the last).
       Therefore, if some_server fails, the function carries on to echo
       "some_serverstartedsuccessfully", and the exit status of the
       function is zero (which means "some_serverfailed" is not output).