SL (Steam Locomotive) runs across your terminal when you type "sl" as you meant to type "ls". It's just a joke command, and not useful at all.
Copyright 1993,1998,2014 Toyoda Masashi ([email protected])
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When no option is given, SL set option(s): -c 1in4, -a 1in7, -l 1in10, -F 1in100