*** Comprehensive list of exit codes from the Linux system:
| Code | Description |
|---|---|
| 0 | Successful exit without errors. |
| 1 | One or more generic errors encountered upon exit. |
| 2 | Incorrect usage, such as invalid options or missing arguments. |
| 126 | Command found but is not executable. |
| 127 | Command not found, usually the result of a missing directory in $PATH variable. |
| 128+N | Command encountered fatal error (was forcefully terminated manually or from an outside source). |
| The N tells us which signal was received (see example below). | |
| 130 | Command terminated with signal 2 (SIGINT) (ctrl+c on keyboard ~ 128+2). |
| 143 | Command terminated with signal 15 (SIGTERM) (kill command ~ 128+15). |