Linux - Signals

Last Updated: 2023-02-05

List all Linux signals:

$ trap -l

e.g.

• 1 - SIGHUP: connection to a remote host is dropped (SSH).
• 2 - SIGINT: interrupt signal, Ctrl-C.
• 3 - SIGQUIT: Ctrl-D.
• 8 - SIGFPE: illegal math operation, like division by zero.
• 9 - SIGKILL: cannot catch it or ignore it. The process is terminated immediately.
• 11 - SIGSEGV: segment fault.
• 15 - SIGTERM: similar to SIGKILL but can be trapped and the process can run its clean-up processes before closing down. The default signal by kill command.