[ "$0" != "$_" ] && echo Sourced
A better version to tell sourced condition, but still doesn't cover all cases.
[ "$0" = "`ps p $$ o cmd=`" ] && echo Sourced
Finally a perfect solution, cheers!
[ "`cat /proc/$$/cmdline`" = "$0" ] && echo Sourced
However /proc/$$/cmdline may contain zero characters and grep may not support -z option, so revised again, almost universal now.
[ "`cat /proc/$$/cmdline | xargs -0 echo`" = "$0" ] && echo Sourced!
Under bash there is a quick way to exit without quitting the console:
return X >&/dev/null || exit X
or
eval "return X >&/dev/null; exit X"
Where X is the exit code, assume sourced and simply returns, if failed, do exit.
Form 2 is treated as an executive unit instead of two separate commands compared to form 1 and is useful in complicated conditions which form 1 won't work, says:
[ ... ] && command 1 && command 2 && eval "return X >&/dev/null; exit X"
return X >&/dev/null || exit X
or
eval "return X >&/dev/null; exit X"
Where X is the exit code, assume sourced and simply returns, if failed, do exit.
Form 2 is treated as an executive unit instead of two separate commands compared to form 1 and is useful in complicated conditions which form 1 won't work, says:
[ ... ] && command 1 && command 2 && eval "return X >&/dev/null; exit X"
