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@ -120,6 +120,7 @@ $? :most recent foreground pipeline exit status.
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$- :current options set for the shell.
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$$ :pid of the current shell (not subshell).
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$! :is the PID of the most recent background command.
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$_ :last of parameterers of recent command.
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$DESKTOP_SESSION current display manager
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$EDITOR preferred text editor.
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