| SIGHUP | 1 | Controlling terminal closed |
| SIGINT | 2 | Request for interrupt sent from keyboard |
| SIGQUIT | 3 | Request for quit sent from keyboard |
| SIGILL | 4 | Illegal instruction |
| SIGTRAP | 5 | Breakpoint instruction |
| SIGABRT | 6 | Request for abort |
| SIGBUS | 7 | Illegal bus cycle |
| SIGFPE | 8 | Floating point exception |
| SIGKILL | 9 | Request for kill |
| SIGUSR1 | 10 | User defined signal 1 |
| SIGSEGV | 11 | Illegal memory access |
| SIGUSR2 | 12 | User defined signal 2 |
| SIGPIPE | 13 | Broken pipe |
| SIGALRM | 14 | Timer alarm |
| SIGTERM | 15 | Request for termination |
| SIGTERM | 16 | Illegal stack access |
| SIGCHLD | 17 | Child process status changed |
| SIGCONT | 18 | Request to continue when stopped |
| SIGSTOP | 19 | Request to stop |
| SIGTSTP | 20 | Request for stop sent from keyboard |
| SIGTTIN | 21 | Input from terminal when on background |
| SIGTTOU | 22 | Output to terminal when on background |