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Add special parameter $_ to bash cheatsheet (#1736)

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Christopher Hopper 2021-11-03 22:06:31 +11:00 committed by GitHub
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@ -755,11 +755,12 @@ read -n 1 ans # Just one character
### Special variables
| Expression | Description |
| ---------- | ---------------------------- |
| ---------- | -------------------------------------- |
| `$?` | Exit status of last task |
| `$!` | PID of last background task |
| `$$` | PID of shell |
| `$0` | Filename of the shell script |
| `$_` | Last argrument of the previous command |
See [Special parameters](http://wiki.bash-hackers.org/syntax/shellvars#special_parameters_and_shell_variables).