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bash trap function

  trap [-lp] [[arg] signal_spec ...]


trap -l
 1) SIGHUP    2) SIGINT    3) SIGQUIT    4) SIGILL    5) SIGTRAP
 6) SIGABRT    7) SIGBUS    8) SIGFPE    9) SIGKILL    10) SIGUSR1
11) SIGSEGV    12) SIGUSR2    13) SIGPIPE    14) SIGALRM    15) SIGTERM
21) SIGTTIN    22) SIGTTOU    23) SIGURG    24) SIGXCPU    25) SIGXFSZ
26) SIGVTALRM    27) SIGPROF    28) SIGWINCH    29) SIGIO    30) SIGPWR
31) SIGSYS    34) SIGRTMIN    35) SIGRTMIN+1    36) SIGRTMIN+2    37) SIGRTMIN+3
38) SIGRTMIN+4    39) SIGRTMIN+5    40) SIGRTMIN+6    41) SIGRTMIN+7    42) SIGRTMIN+8
43) SIGRTMIN+9    44) SIGRTMIN+10    45) SIGRTMIN+11    46) SIGRTMIN+12    47) SIGRTMIN+13
48) SIGRTMIN+14    49) SIGRTMIN+15    50) SIGRTMAX-14    51) SIGRTMAX-13    52) SIGRTMAX-12
53) SIGRTMAX-11    54) SIGRTMAX-10    55) SIGRTMAX-9    56) SIGRTMAX-8    57) SIGRTMAX-7
58) SIGRTMAX-6    59) SIGRTMAX-5    60) SIGRTMAX-4    61) SIGRTMAX-3    62) SIGRTMAX-2
63) SIGRTMAX-1    64) SIGRTMAX    


kill -l displays same list


it’s possible to react only to signals which allows the script to respond: the SIGKILL and SIGSTOP signals cannot be caught, blocked or ignored.

 signal can be specified either by its number or by its name,

 even without the SIG prefix.


-p : list  all previously set traps 

-p name : list only trap with name  previously set


trap 'echo "SIGINT caught!"' SIGINT

trap -p
trap -- 'echo "SIGINT caught!"' SIGINT


press ctrl+c

SIGINT caught!

trap 'echo "signal caught, cleaning..."; rm -i linux_tarball.tar.xz' SIGINT SIGTERM

 its exist status will be the result of 128 + the signal number


disable traps 


pseudo signals

EXIT    on exit script

ERR   non zero exit status


This will cause the argument of the trap to be executed before every simple command,
for, case or select commands, and before the first command in shell functions.


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