@ -12,28 +12,28 @@ Includes support for bash string replacement functions.
| __Expression__ | __Meaning__ |
| ----------------- | -------------- |
| `${var}` | Value of `$var`
| `${var-${DEFAULT}}` | If `$var` is not set, evaluate expression as `${DEFAULT}`
| `${var:-${DEFAULT}}` | If `$var` is not set or is empty, evaluate expression as `${DEFAULT}`
| `${var=${DEFAULT}}` | If `$var` is not set, evaluate expression as `${DEFAULT}`
| `${var:=${DEFAULT}}` | If `$var` is not set or is empty, evaluate expression as `${DEFAULT}`
| `$$var` | Escape expressions. Result will be the string `$var`
| `${#var}` | String length of `$var`
| `${var^}` | Uppercase first character of `$var`
| `${var^^}` | Uppercase all characters in `$var`
| `${var,}` | Lowercase first character of `$var`
| `${var,,}` | Lowercase all characters in `$var`
| `${#var}` | String length of `$var`
| `${var:n}` | Offset `$var``n` characters from start
| `${var: -n}` | Offset `$var``n` characters from end
| `${var:n:len}` | Offset `$var``n` characters with max length of `len`
| `${var#pattern}` | Strip shortest `pattern` match from start
| `${var##pattern}` | Strip longest `pattern` match from start
| `${var%pattern}` | Strip shortest `pattern` match from end
| `${var%%pattern}` | Strip longest `pattern` match from end
| `${var-default` | If `$var` is not set, evaluate expression as `$default`
| `${var:-default` | If `$var` is not set or is empty, evaluate expression as `$default`
| `${var=default` | If `$var` is not set, evaluate expression as `$default`
| `${var:=default` | If `$var` is not set or is empty, evaluate expression as `$default`
| `${var/pattern/replacement}` | Replace as few `pattern` matches as possible with `replacement`
| `${var//pattern/replacement}` | Replace as many `pattern` matches as possible with `replacement`
| `${var/#pattern/replacement}` | Replace `pattern` match with `replacement` from `$var` start
| `${var/%pattern/replacement}` | Replace `pattern` match with `replacement` from `$var` end
For a deeper reference, see [bash-hackers](https://wiki.bash-hackers.org/syntax/pe#case_modification) or [gnu pattern matching](https://www.gnu.org/software/bash/manual/html_node/Pattern-Matching.html).
## Unsupported Functions
* `${var-default}`
@ -41,4 +41,4 @@ Includes support for bash string replacement functions.
TP Honey
3 years ago