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nick-w-nick
61a46bf95a Merge 295fe153ad into 1513611857 2024-11-15 01:08:52 -05:00
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@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
_1508 TILs and counting..._
_1507 TILs and counting..._
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@@ -1465,7 +1465,6 @@ _1508 TILs and counting..._
- [Global Substitution On The Previous Command](unix/global-substitution-on-the-previous-command.md)
- [Globbing For All Directories In Zsh](unix/globbing-for-all-directories-in-zsh.md)
- [Globbing For Filenames In Zsh](unix/globbing-for-filenames-in-zsh.md)
- [Gracefully Exit A Script With Trap](unix/gracefully-exit-a-script-with-trap.md)
- [Grep For Files Without A Match](unix/grep-for-files-without-a-match.md)
- [Grep For Files With Multiple Matches](unix/grep-for-files-with-multiple-matches.md)
- [Grep For Multiple Patterns](unix/grep-for-multiple-patterns.md)

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# Gracefully Exit A Script With Trap
With `trap` you can intercept signals that would cause your script to exit and
then inject some additional behavior. Perhaps you want to make sure the script
cleans up after itself before it exists.
During this script's execution, it creates a file in the filesystem. It would
be nice to make sure that no matter path this script ends up down that it will
clean up after itself as it exits. We set up a `trap` that looks for the `EXIT`
signal to do this.
```bash
# Set up trap
trap 'echo "Cleaning up temp files"; rm -f *.tmp' EXIT
# Create temporary file
echo "test data" > work.tmp
# Do some work
cat work.tmp
# Trap will clean up on exit
```
Whatever is in quotes is what the trap will execute when it is triggered. The
following one or more signals are what the trap listens for, in this case
`EXIT`.
[source](https://tldp.org/LDP/Bash-Beginners-Guide/html/sect_12_02.html)