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@ -47,6 +47,7 @@ See something incorrectly described, buggy or outright wrong? Open an issue or s
* [Loop over a variable range of numbers](#loop-over-a-variable-range-of-numbers)
* [Loop over the contents of a file](#loop-over-the-contents-of-a-file)
* [Loop over files and directories](#loop-over-files-and-directories)
* [Filter the argument list](#filter-the-argument-list)
* [VARIABLES](#variables)
* [Name a variable based on another variable](#name-a-variable-based-on-another-variable)
* [ESCAPE SEQUENCES](#escape-sequences)
@ -675,6 +676,31 @@ for dir in ~/Downloads/*/; do
done
```
# Filter the argument list
This is a general technique for looping over the argument list, dropping
any arguments for which some `<test>` fails.
``` shell
for arg do
shift
<test> || continue
set -- "$@" "$arg"
done
```
**Example:**
Drop arguments that are not directories. For simple, one-liner
tests like this we can use `&&` instead of `|| continue`.
``` shell
for arg do
shift
[ -d "$arg" ] && set -- "$@" "$arg"
done
```
# VARIABLES
## Name and access a variable based on another variable