Capture exit code and output of a command

The name of the pictureThe name of the pictureThe name of the pictureClash Royale CLAN TAG#URR8PPP











up vote
3
down vote

favorite












I'd like to do:



1.sh:



#!/usr/bin/env bash
set -eu
r=0
a=$(./2.sh || r=$?)
echo "$a"
echo "$r"


2.sh:



#!/usr/bin/env bash
echo output
exit 2


But it outputs:



$ ./1.sh
output
0 # I'd like to have `2` here


Since $(...) runs a separate shell. So, how do I capture both, exit code and output?






shell command-substitution return-status







share|improve this question























  • a=$(./2.sh); r=$?; ## doesn't work?
    – Jeff Schaller
    Mar 4 '16 at 11:34










  • The reason 1.sh has an exit code of 0 not 2 is because echo "$r" is a command that exits 0.
    – Mikkel
    May 29 at 14:20














up vote
3
down vote

favorite












I'd like to do:



1.sh:



#!/usr/bin/env bash
set -eu
r=0
a=$(./2.sh || r=$?)
echo "$a"
echo "$r"


2.sh:



#!/usr/bin/env bash
echo output
exit 2


But it outputs:



$ ./1.sh
output
0 # I'd like to have `2` here


Since $(...) runs a separate shell. So, how do I capture both, exit code and output?






shell command-substitution return-status







share|improve this question























  • a=$(./2.sh); r=$?; ## doesn't work?
    – Jeff Schaller
    Mar 4 '16 at 11:34










  • The reason 1.sh has an exit code of 0 not 2 is because echo "$r" is a command that exits 0.
    – Mikkel
    May 29 at 14:20












up vote
3
down vote

favorite









up vote
3
down vote

favorite











I'd like to do:



1.sh:



#!/usr/bin/env bash
set -eu
r=0
a=$(./2.sh || r=$?)
echo "$a"
echo "$r"


2.sh:



#!/usr/bin/env bash
echo output
exit 2


But it outputs:



$ ./1.sh
output
0 # I'd like to have `2` here


Since $(...) runs a separate shell. So, how do I capture both, exit code and output?






shell command-substitution return-status







share|improve this question















I'd like to do:



1.sh:



#!/usr/bin/env bash
set -eu
r=0
a=$(./2.sh || r=$?)
echo "$a"
echo "$r"


2.sh:



#!/usr/bin/env bash
echo output
exit 2


But it outputs:



$ ./1.sh
output
0 # I'd like to have `2` here


Since $(...) runs a separate shell. So, how do I capture both, exit code and output?






shell command-substitution return-status




shell command-substitution return-status






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Aug 26 at 14:24









Peter Mortensen

79748




79748










asked Mar 4 '16 at 11:28









x-yuri

1,11911641




1,11911641











  • a=$(./2.sh); r=$?; ## doesn't work?
    – Jeff Schaller
    Mar 4 '16 at 11:34










  • The reason 1.sh has an exit code of 0 not 2 is because echo "$r" is a command that exits 0.
    – Mikkel
    May 29 at 14:20
















  • a=$(./2.sh); r=$?; ## doesn't work?
    – Jeff Schaller
    Mar 4 '16 at 11:34










  • The reason 1.sh has an exit code of 0 not 2 is because echo "$r" is a command that exits 0.
    – Mikkel
    May 29 at 14:20















a=$(./2.sh); r=$?; ## doesn't work?
– Jeff Schaller
Mar 4 '16 at 11:34




a=$(./2.sh); r=$?; ## doesn't work?
– Jeff Schaller
Mar 4 '16 at 11:34












The reason 1.sh has an exit code of 0 not 2 is because echo "$r" is a command that exits 0.
– Mikkel
May 29 at 14:20




The reason 1.sh has an exit code of 0 not 2 is because echo "$r" is a command that exits 0.
– Mikkel
May 29 at 14:20










1 Answer
1






active

oldest

votes

















up vote
8
down vote



accepted










The exit code of a process calling another process is the one of the called process. 



$($($($($(exit 2)))))
echo $?
2


Here there are 5 levels of calling.



In your case:



r=0
a=$(./2.sh)
r=$?
echo "$a"
echo "$r"





share|improve this answer






















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    1 Answer
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    active

    oldest

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    1 Answer
    1






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes








    up vote
    8
    down vote



    accepted










    The exit code of a process calling another process is the one of the called process. 



    $($($($($(exit 2)))))
    echo $?
    2


    Here there are 5 levels of calling.



    In your case:



    r=0
    a=$(./2.sh)
    r=$?
    echo "$a"
    echo "$r"





    share|improve this answer


























      up vote
      8
      down vote



      accepted










      The exit code of a process calling another process is the one of the called process. 



      $($($($($(exit 2)))))
      echo $?
      2


      Here there are 5 levels of calling.



      In your case:



      r=0
      a=$(./2.sh)
      r=$?
      echo "$a"
      echo "$r"





      share|improve this answer
























        up vote
        8
        down vote



        accepted







        up vote
        8
        down vote



        accepted






        The exit code of a process calling another process is the one of the called process. 



        $($($($($(exit 2)))))
        echo $?
        2


        Here there are 5 levels of calling.



        In your case:



        r=0
        a=$(./2.sh)
        r=$?
        echo "$a"
        echo "$r"





        share|improve this answer














        The exit code of a process calling another process is the one of the called process. 



        $($($($($(exit 2)))))
        echo $?
        2


        Here there are 5 levels of calling.



        In your case:



        r=0
        a=$(./2.sh)
        r=$?
        echo "$a"
        echo "$r"






        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited Mar 4 '16 at 12:10









        Jeff Schaller

        32.7k849110




        32.7k849110










        answered Mar 4 '16 at 11:36









        Emmanuel

        2,92911020




        2,92911020



























             

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