Exam LX0-104 topic 1 question 12 discussion

C. It is the exit value of the command executed immediately before echo The echo $? command in a shell outputs the exit value of the last executed command. In this case, if it outputs 1, it means that the command executed immediately before the echo command terminated with a non-zero exit value. A non-zero exit value usually indicates an error or failure of some sort. The value of the exit status can be used by shell scripts or other programs to determine the success or failure of a previous command. This makes it a useful mechanism for controlling the flow of a shell script or program based on the success or failure of individual commands.