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Dylan Araps 2019-09-19 12:00:25 +03:00
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@ -46,6 +46,9 @@ A collection of pure POSIX `sh` alternatives to external processes
* [Miscellaneous](#miscellaneous)
* [ARITHMETIC](#arithmetic-1)
* [Ternary Tests](#ternary-tests)
* [TRAPS](#traps)
* [Do something on script exit](#do-something-on-script-exit)
* [Ignore terminal interrupt (CTRL+C, SIGINT)](#ignore-terminal-interrupt-ctrlc-sigint)
<!-- vim-markdown-toc -->
@ -520,3 +523,26 @@ For use in `[ ]` `if [ ]; then` and `test`.
# ': var': If the test fails.
var=$((var2 > var ? var2 : var))
```
# TRAPS
Traps allow a script to execute code on various signals. In [pxltrm](https://github.com/dylanaraps/pxltrm) (*a pixel art editor written in bash*) traps are used to redraw the user interface on window resize. Another use case is cleaning up temporary files on script exit.
Traps should be added near the start of scripts so any early errors are also caught.
## Do something on script exit
```shell
# Clear screen on script exit.
trap 'printf \\e[2J\\e[H\\e[m' EXIT
# Run a function on script exit.
# 'clean_up' is the name of a function.
trap clean_up EXIT
```
## Ignore terminal interrupt (CTRL+C, SIGINT)
```shell
trap '' INT
```