Bash ignoring error for a particular command

Question

I am using following options  set -o pipefail set -e   In bash script to stop execution on error  I have  100 lines of script executing and I don t want to check return code of every line in the script    But for one particular command  I want to ignore the error  How can I do that

User · Answer

If you want to prevent your script failing and collect the return code:

command () {
    return 1  # or 0 for success
}

set -e

command && returncode=$? || returncode=$?
echo $returncode

returncode is collected no matter whether command succeeds or fails.

User · Answer

I have been using the snippet below when working with CLI tools and I want to know if some resource exist or not  but I don t care about the output     if   -z    cat no exist 2 gt  amp 1  gt  dev null      then     echo  none exist actually exist   fi

User · Answer

Just add    true after the command where you want to ignore the error

User · Answer

while    true is preferred one  but you can also do   var   echo   exit 1     it shouldn t fail

User · Answer

The solution   particular script    true   Example     cat  tmp 1 sh particular script         false    set -e  echo one particular script    true echo two particular script echo three    bash  tmp 1 sh one two   three will be never printed   Also  I want to add that when pipefail is on  it is enough for shell to think that the entire pipe has non-zero exit code when one of commands in the pipe has non-zero exit code  with pipefail off it must the last one      set -o pipefail   false   true   echo    1   set  o pipefail   false   true   echo    0

User · Answer

output    command  2 gt  amp 1   amp  amp  exit status       exit status    echo  output echo  exit status   Example of using this to create a log file  log event    timestamp   date    D  T    mm dd yy HH MM SS echo -e    timestamp   event   gt  gt    log file     output    command  2 gt  amp 1   amp  amp  exit status       exit status     if     exit status    0       then         event   output          log event     else         event  ERROR  output          log event fi

User · Answer

No solutions worked for me from here  so I found another one   set  e find    csharp Platform  REPOSITORY NAME obj  -type f -iname    cs  -delete find    csharp Platform  REPOSITORY NAME Tests obj  -type f -iname    cs  -delete set -e   This is useful for CI  amp  CD  This way the error messages are printed but the whole script continues to execute

User · Answer

Instead of  returning true   you can also use the  noop  or null utility  as referred in the POSIX specs    and just  do nothing   You ll save a few letters         usr bin env bash set -e man nonexistentghing       echo  It s ok

User · Answer

Thanks for the simple solution here from above    lt particular script command gt     true   The following construction could be used for additional actions troubleshooting of script steps and additional flow control options   if  lt particular script command gt  then    echo   lt particular script command gt  is fine   else    echo   lt particular script command gt  failed       exit 1 fi   We can brake the further actions and exit 1 if required

User · Answer

More concisely     particular script   From the POSIX specification regarding set -e  emphasis mine       When this option is on  if a simple command fails for any of the reasons listed in Consequences of Shell Errors or returns an exit status value  0  and is not part of the compound list following a while  until  or if keyword  and is not a part of an AND or OR list  and is not a pipeline preceded by the   reserved word  then the shell shall immediately exit

User · Answer

Don t stop and also save exit status  Just in case if you want your script not to stop if a particular command fails and you also want to save error code of failed command   set -e EXIT CODE 0 command    EXIT CODE    echo  EXIT CODE

User · Answer

I kind of like this solution       particular script    The command script between the back ticks is executed and its output is fed to the command      which is the equivalent of  true      false   echo    1      false    echo    0   edit  Fixed ugly typo

[linux] Bash ignoring error for a particular command

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