#!/bin/bash

if [ x$BASH_SOURCE = x"" ] ; then
    echo please run by $0 or bash $0 instead.
    exit 1
fi
echo OK: you are using bash.

$ sh ./check.sh 
please run by ./check.sh or bash ./check.sh instead.

$ ./check.sh 
OK: you are using bash.

$ bash ./check.sh 
OK: you are using bash.

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