Kill signals
| Signal | Value | Action | Comment |
| SIGHUP | 1 | Term | Hangup detected on controlling terminal or death of controlling |
| SIGINT | 2 | Term | Interrupt from keyboard |
| SIGQUIT | 3 | Core | Quit from keyboard |
| SIGILL | 4 | Core | Illegal Instruction |
| SIGABRT | 6 | Core | Abort signal from abort(3) |
| SIGFPE | 8 | Core | Floating point exception |
| SIGKILL | 9 | Core | Kill signalort signal |
| SIGSEGV | 11 | Core | Invalid memory reference |
| SIGPIPE | 13 | Core | Broken pipe: write to pipe with no readers |
| SIGALRM | 14 | Core | Timer signal from alarm(2) |
| SIGTERM | 15 | Core | Termination signal |
| SIGUSR1 | 30,10,16 | Core | User-defined signal 1 |
| SIGUSR2 | 31,12,17 | Core | User-defined signal 2 |
| SIGCHLD | 20,17,18 | Core | Child stopped or terminated |
| SIGCONT | 19,18,25 | Continue if stopped | |
| SIGSTOP | 17,19,23 | Core | Stop process |
| SIGTSTP | 18,20,24 | Core | Stop typed as tty |
| SIGTIN | 21,21,26 | Core | tty input for background process |
| SIGTOU | 22,22,27 | Core | tty output for background process |