Why does this script keep running after receiving SIGINT?

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I learned from https://unix.stackexchange.com/a/230568/674 thatping will exit with 0 after receiving SIGINT, which allows a bash script containing a ping command to continue running instead of exiting.



I have a script with similar behavior:



#!/bin/bash 

while true; do
 sudo -S sleep 4;
 echo $?
 sudo -k;
done


When I run it, I type Ctrl-C when it asks me for password, and the script doesn't exit, but continue running. The only difference is that sudo upon receiving SIGINT exits with 1 not 0. So I wonder why the bash script doesn't exit but continue running? Thanks.



$ ./test.sh 
[sudo] password for t: 
1
[sudo] password for t: 
1
[sudo] password for t: 
1
...





bash sudo sigint






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    up vote
    0
    down vote

    favorite












    I learned from https://unix.stackexchange.com/a/230568/674 thatping will exit with 0 after receiving SIGINT, which allows a bash script containing a ping command to continue running instead of exiting.



    I have a script with similar behavior:



    #!/bin/bash 

    while true; do
     sudo -S sleep 4;
     echo $?
     sudo -k;
    done


    When I run it, I type Ctrl-C when it asks me for password, and the script doesn't exit, but continue running. The only difference is that sudo upon receiving SIGINT exits with 1 not 0. So I wonder why the bash script doesn't exit but continue running? Thanks.



    $ ./test.sh 
    [sudo] password for t: 
    1
    [sudo] password for t: 
    1
    [sudo] password for t: 
    1
    ...





    bash sudo sigint






    share























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I learned from https://unix.stackexchange.com/a/230568/674 thatping will exit with 0 after receiving SIGINT, which allows a bash script containing a ping command to continue running instead of exiting.



      I have a script with similar behavior:



      #!/bin/bash 

      while true; do
       sudo -S sleep 4;
       echo $?
       sudo -k;
      done


      When I run it, I type Ctrl-C when it asks me for password, and the script doesn't exit, but continue running. The only difference is that sudo upon receiving SIGINT exits with 1 not 0. So I wonder why the bash script doesn't exit but continue running? Thanks.



      $ ./test.sh 
      [sudo] password for t: 
      1
      [sudo] password for t: 
      1
      [sudo] password for t: 
      1
      ...





      bash sudo sigint






      share













      I learned from https://unix.stackexchange.com/a/230568/674 thatping will exit with 0 after receiving SIGINT, which allows a bash script containing a ping command to continue running instead of exiting.



      I have a script with similar behavior:



      #!/bin/bash 

      while true; do
       sudo -S sleep 4;
       echo $?
       sudo -k;
      done


      When I run it, I type Ctrl-C when it asks me for password, and the script doesn't exit, but continue running. The only difference is that sudo upon receiving SIGINT exits with 1 not 0. So I wonder why the bash script doesn't exit but continue running? Thanks.



      $ ./test.sh 
      [sudo] password for t: 
      1
      [sudo] password for t: 
      1
      [sudo] password for t: 
      1
      ...





      bash sudo sigint




      bash sudo sigint





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      asked 2 mins ago









      Tim

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