how to use kill SIGUSR2 in bash?
SIGUSR2 is architecture depended and can have a value out of 31, 12 or 17. This is described in man 7 signal. You'll have to find out which value is appropriate for your system. Usually this is done by having a look into:
/usr/include/asm/signal.h On my system - Ubuntu 12.04 AMD 64 - it has a value of 12:
#define SIGUSR2 12Once you know the proper numeric value for SIGUSR2 on your system, you can send this signal using:
kill -SIGNO PID# In this casekill -12 PID
On my Linux box it works.
I ran an infinite loop (pid = 4574), then I ran
#!/bin/bashkill -l | grep USR2kill -SIGUSR2 4574kill -l has showed the signal and kill -SIGUSR2 has sent the signal (killing the process).
Check if you are running Bash or some other shell (e.g., dash, busybox, etc.)