List the signal names. (Used by itself.)
The signal number (from ps -f) or name (from kill -l). With a signal number of 9, the kill is absolute.
Signals are defined in /usr/include/sys/signal.h and are listed here without the SIG prefix.
HUP 1 hangup INT 2 interrupt QUIT 3 quit ILL 4 illegal instruction TRAP 5 trace trap IOT 6 IOT instruction EMT 7 EMT instruction FPE 8 floating point exception KILL 9 kill BUS 10 bus error SEGV 11 segmentation violation SYS 12 bad argument to system call PIPE 13 write to pipe, but no process to read it ALRM 14 alarm clock TERM 15 software termination (the default signal) USR1 16 user-defined signal 1 USR2 17 user-defined signal 2 CLD 18 child process died PWR 19 restart after power failure