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add to "variable" section

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eval command to expand and execute variables
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Bonnie I-Man Ng 2019-07-10 16:40:14 +08:00 committed by GitHub
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@ -987,6 +987,14 @@ echo ${var,,}
helloworld helloworld
``` ```
##### Expand and then execute variable/argument
```bash
cmd="bar=foo"
eval "$cmd"
echo "$bar" # foo
```
## Math ## Math
[[back to top](#handy-bash-one-liners)] [[back to top](#handy-bash-one-liners)]
##### Arithmetic Expansion in Bash (Operators: +, -, *, /, %, etc) ##### Arithmetic Expansion in Bash (Operators: +, -, *, /, %, etc)