bash

    Find the exit status of a previous command in Bash

    RyanBy 1 Min Read

    Most programs will return an exit status of 0 if the program was successful, while a non-zero exit status usually indicates an error. You can find the exit status or exit code of the previously executed command by accessing the “$?” shell variable.

    $ COMMAND
    $ echo $?

    Typically when a command terminates on a fatal signal whose number is N, Bash uses the value 128+N as the exit status. If a command is not found, the child process created to execute it returns a status of 127. If a command is found but is not executable, the return status is 126.

    You can also use the exit status in a conditional.

    #!/bin/bash
    COMMAND
    STATUS=$?
    if [ $STATUS -eq 0 ]; then
    echo "Command Successful"
    else
    echo "Command Failed"
    fi

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