How to wait in bash for several subprocesses to finish, and return exit code !=0 when any subprocess ends with code !=0?

How to wait in bash for several subprocesses to finish, and return exit code !=0 when any subprocess ends with code !=0?

In bash, you can wait for several subprocesses to finish and return an exit code different from zero if any subprocess ends with a non-zero exit code using the wait command in conjunction with a loop. Here's a script demonstrating how to achieve this:

#!/bin/bash # Array to store process IDs pids=() # Function to execute subprocesses execute_subprocess() { # Execute subprocesses in background some_command_1 & pids+=($!) some_command_2 & pids+=($!) some_command_3 & pids+=($!) } # Execute subprocesses execute_subprocess # Wait for all subprocesses to finish for pid in "${pids[@]}"; do wait "$pid" # Check if subprocess exit code is non-zero if [ $? -ne 0 ]; then exit 1 # Exit with non-zero code if any subprocess failed fi done # Exit with zero code if all subprocesses succeeded exit 0

In this script:

  • The execute_subprocess function defines the subprocesses you want to run in the background. You can replace some_command_1, some_command_2, and some_command_3 with the actual commands you want to execute.
  • The process IDs (PIDs) of the subprocesses are stored in the pids array.
  • After launching all subprocesses, a loop iterates over the array of process IDs. It uses the wait command to wait for each subprocess to finish.
  • Within the loop, the script checks if the exit code of each subprocess is non-zero. If any subprocess fails, the script exits with a non-zero exit code (exit 1).
  • If all subprocesses succeed, the script exits with a zero exit code (exit 0).

Adjust the script according to the specific subprocesses you want to execute and any additional logic you may need.

Examples

  1. "Bash wait for multiple subprocesses and return non-zero exit code on failure"

    • Description: This query addresses waiting for several subprocesses to finish in a Bash script and returning a non-zero exit code if any subprocess ends with a non-zero exit code.
    • Code:
      #!/bin/bash # Run subprocesses in the background command1 & pid1=$! command2 & pid2=$! command3 & pid3=$! # Wait for all subprocesses to finish wait $pid1 exit_code1=$? wait $pid2 exit_code2=$? wait $pid3 exit_code3=$? # Check exit codes and return non-zero if any subprocess fails if [ $exit_code1 -ne 0 ] || [ $exit_code2 -ne 0 ] || [ $exit_code3 -ne 0 ]; then exit 1 fi

  2. "Bash wait for multiple background processes and return failure if any fails"

    • Description: This query is about waiting for multiple background processes to finish in Bash and returning a failure if any of them fail.
    • Code:
      #!/bin/bash # Define functions or commands as subprocesses function1() { # Command or function body } function2() { # Command or function body } function3() { # Command or function body } # Run subprocesses in the background function1 & pid1=$! function2 & pid2=$! function3 & pid3=$! # Wait for all subprocesses to finish wait $pid1 && wait $pid2 && wait $pid3

  3. "Bash wait for multiple processes to complete and return non-zero on failure"

    • Description: This query aims to wait for several processes to complete in a Bash script and return a non-zero exit code if any of them fail.
    • Code:
      #!/bin/bash # Run subprocesses in the background command1 & pid1=$! command2 & pid2=$! command3 & pid3=$! # Wait for all subprocesses to finish wait $pid1 || exit 1 wait $pid2 || exit 1 wait $pid3 || exit 1

  4. "Bash script wait for background processes and return error on failure"

    • Description: This query deals with waiting for background processes to finish in a Bash script and returning an error if any of them fail.
    • Code:
      #!/bin/bash # Run subprocesses in the background command1 & command2 & command3 & # Wait for all subprocesses to finish and capture their exit codes wait -n exit_code=$? # If any subprocess fails, return non-zero exit code if [ $exit_code -ne 0 ]; then exit 1 fi

  5. "Bash wait for multiple child processes and return non-zero on failure"

    • Description: This query focuses on waiting for multiple child processes in Bash and returning a non-zero exit code if any of them fail.
    • Code:
      #!/bin/bash # Define the commands as subprocesses command1() { # Command body } command2() { # Command body } command3() { # Command body } # Run subprocesses in the background command1 & pid1=$! command2 & pid2=$! command3 & pid3=$! # Wait for all subprocesses to finish wait $pid1 && wait $pid2 && wait $pid3 || exit 1

  6. "Bash wait for multiple background jobs and return non-zero exit code on failure"

    • Description: This query pertains to waiting for multiple background jobs to complete in Bash and returning a non-zero exit code if any of them fail.
    • Code:
      #!/bin/bash # Start background jobs command1 & pid1=$! command2 & pid2=$! command3 & pid3=$! # Wait for all jobs to complete and check their exit status wait $pid1 $pid2 $pid3 exit_code=$? # Return non-zero exit code if any job failed if [ $exit_code -ne 0 ]; then exit 1 fi

  7. "Bash wait for multiple subprocesses and return non-zero on error"

    • Description: This query involves waiting for multiple subprocesses in Bash and returning a non-zero exit code if any of them encounter an error.
    • Code:
      #!/bin/bash # Start subprocesses in the background command1 & pid1=$! command2 & pid2=$! command3 & pid3=$! # Wait for all subprocesses to finish wait $pid1 $pid2 $pid3 # Check exit statuses and return non-zero on error if [ $? -ne 0 ]; then exit 1 fi

  8. "Bash wait for multiple processes to complete and return non-zero on error"

    • Description: This query focuses on waiting for multiple processes to complete in Bash and returning a non-zero exit code if any of them encounter an error.
    • Code:
      #!/bin/bash # Run subprocesses in the background command1 & pid1=$! command2 & pid2=$! command3 & pid3=$! # Wait for all subprocesses to finish and capture their exit codes wait $pid1 $pid2 $pid3 exit_code=$? # If any subprocess fails, return non-zero exit code if [ $exit_code -ne 0 ]; then exit 1 fi

  9. "Bash wait for multiple child processes and return non-zero on failure"

    • Description: This query deals with waiting for multiple child processes in Bash and returning a non-zero exit code if any of them fail.
    • Code:
      #!/bin/bash # Run subprocesses in the background command1 & pid1=$! command2 & pid2=$! command3 & pid3=$! # Wait for all subprocesses to finish and check exit codes wait $pid1 && wait $pid2 && wait $pid3 || exit 1

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