Using trap to react to signals and system events

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|Parameter|Meaning| |––|––| |-p|List currently installed traps| |-l|List signal names and corresponding numbers


The trap utility is a special shell built-in. It’s defined in POSIX, but bash adds some useful extensions as well.

Examples that are POSIX-compatible start with #!/bin/sh, and examples that start with #!/bin/bash use a bash extension.

The signals can either be a signal number, a signal name (without the SIG prefix), or the special keyword EXIT.

Those guaranteed by POSIX are:

Number | Name | Notes —––|———|—–– 0 | EXIT | Always run on shell exit, regardless of exit code 1 | SIGHUP | 2 | SIGINT | This is what ^C sends 3 | SIGQUIT | 6 | SIGABRT | 9 | SIGKILL | 14 | SIGALRM | 15 | SIGTERM | This is what kill sends by default

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