CS155: Introduction to Unix
Spring 2018
Command Anatomy
command options arguments <input >output
Options start with a dash, and are, y’know, optional.
An option might have its own option-argument, or it might not—it
could be -f or -o foo, depending on the command.
An argument could be pretty much anything. It might be a filename,
as in cat food, or it might be a word, like echo Hello.
| No options or arguments | date
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| Two arguments | cp from to
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| One argument | echo "hi there"
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| One option, output redirection | date -u >gmt
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| Two options w/arguments, one filename argument | cut -d"/" -f 3 bob
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Is foo an option argument, or a regular argument?
| alpha -b foo bar
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