CODEWITHSUNDEEP
perlbasherror-handling
Daniel Standage
Daniel Standage

Reputation: 8304

"DIE" signal handler for bash

In Perl, you can write a $SIG{__DIE__} handler to execute code if the program is exiting with an error. Does bash provide similar functionality?

Here's what I'm trying to do: I have a bash script that creates a new directory and calls several commands which in turn populates the new directory with data files. I'm using set -e so that the script will terminate immediately if any of the commands fail. In case of a failure, I would like the script to remove the directory that it created. If the script completes successfully, then of course the new output should remain.

Does bash provide a DIE signal handler, or any similar functionality that would enable me to do this?

Upvotes: 1

Views: 261

Answers (1)

nneonneo
nneonneo

Reputation: 179392

Since you're using set -e, you can install an ERR handler:

trap errfunc ERR

errfunc will be called if any command exits with a nonzero exit code (and because you are using set -e, this will terminate the script).

You can pass arguments this way, too:

trap 'errfunc $LINENO' ERR

Since the trap command is eval'd at the point of the error, this trap will pass the failing command's line number to errfunc.

Upvotes: 5

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