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add handy environment variables

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onceupon 2017-03-29 17:48:14 +08:00 committed by GitHub
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@ -1327,6 +1327,15 @@ cat file|rev | cut -d/ -f1 | rev
((var++))
```
##### 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
## System
[[back to top](#handy-bash-oneliner-commands-for-tsv-file-editing)]