In shell scripting, which of the following is a zero exit code typically indicating success?

• A. 0
• B. 1
• C. 2
• D. 255

Answer: (A)

In Unix-like shells, exit codes tell you whether a command finished successfully or encountered a problem. A zero exit code means the command completed as expected. Non-zero exit codes signal an error or a special condition, and the specific number can vary by program. Because of this convention, the zero exit code is the standard indicator of success. You can verify it by checking the last command’s exit status (the value stored after a command runs); if it’s zero, the command succeeded. The other non-zero values indicate some form of failure, not success.