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@ -1328,13 +1328,13 @@ cat file|rev | cut -d/ -f1 | rev
```
##### some handy environment variables
$0 :name of shell or shell script. &nbsp
$1, $2, $3, ... :positional parameters. &nbsp
$# :number of positional parameters. &nbsp
$? :most recent foreground pipeline exit status. &nbsp
$- :current options set for the shell. &nbsp
$$ :pid of the current shell (not subshell). &nbsp
$! :is the PID of the most recent background command. &nbsp
$0 :name of shell or shell script.
$1, $2, $3, ... :positional parameters.
$# :number of positional parameters.
$? :most recent foreground pipeline exit status.
$- :current options set for the shell.
$$ :pid of the current shell (not subshell).
$! :is the PID of the most recent background command.
## System