Create README.md

Add '$_'  it contains last of parameterers of recent command.
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sarlej 2022-05-09 13:32:42 +02:00 committed by GitHub
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@ -118,6 +118,7 @@ $? :most recent foreground pipeline exit status.
$- :current options set for the shell. $- :current options set for the shell.
$$ :pid of the current shell (not subshell). $$ :pid of the current shell (not subshell).
$! :is the PID of the most recent background command. $! :is the PID of the most recent background command.
$_ :last of parameterers of recent command.
$DESKTOP_SESSION current display manager $DESKTOP_SESSION current display manager
$EDITOR preferred text editor. $EDITOR preferred text editor.