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shell: added bracket expansions

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tiyn 2023-08-05 00:19:26 +02:00
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@ -24,6 +24,29 @@ The following is a list of Unix shells that are POSIX compliant.
This section addresses various different functions by and actions that can be
taken with shell commands.
### Expansion
This section is based on the
[TLDP Bash guide for beginners](https://tldp.org/LDP/Bash-Beginners-Guide/html/sect_03_04.html).
Although it is centered on Bash it can also be used in other shells (Zsh) while being unsupported
by others (DASH).
In most shells curly braces can be used to expand a term.
Commands can be expanded like the following example.
```sh
echo sp{el,il,al}l
```
The previous command will expand to the following command.
```sh
echo spell spill spall
```
The example shows a brace expansions of depth `1`.
Using multiple curly brace pairs the depth can be increased as needed.
### For Loops
For loops can be especially useful when scripting.