How to output return code in shell?

问题

I'm trying to call a custom shell script through sh:

/bin/sh -c 'myscript.sh` >log.txt 2>&1 & echo $!

Output of this command is a PID of a created background process. I want to instruct /bin/sh to save return code of myscript.sh to some file. Is it possible?

回答1:

(/bin/sh -c "myscript.sh" >log.txt 2>&1 ; echo $? >somefile) & echo $!

回答2:

echo $? >> /path/to/return_code

$? has the return code of the last statement in bash.

回答3:

(
/bin/sh -c 'myscript.sh` >log.txt 2>&1
echo $? > some_file
) &

来源：https://stackoverflow.com/questions/6810279/how-to-output-return-code-in-shell