notes/unix_programming_environment/shell_signal_numbers.txt

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------------------------- Table 5.4 -------------------------
Shell Signal Numbers
0 shell exit (for any reason, including end of file)
1 hangup
2 interrupt (DEL key)
3 quit (ctl-\; causes program to produce core dump)
9 kill (cannot be caught or ignored)
15 terminate, default signal generated by kill(1)