Command Switches
Switches define optional behaviors
| Switch format and syntax rules are command specific. Commands not rooted in Unix are frequently atypical. |
A switch begins with a single hyphen followed by a single alpha character or digit
OR
1 to 2 hyphens followed by a word.
| Switches are case sensitive |
Depending on the command, and the switch, switches may be grouped.
screencapture -ciW
'c' forces clipboard mode
'i' enables interactive mode
'W' enables window selection mode.
The order in which switches are grouped is not important.
Switches may also be stated as separate parameters.
A switch may take an argument
screencapture -ciW -t'jpeg'
or
screencapture -ciW -tjpeg
The -t switch defines the image format as jpeg rather than the default png.
A switch may take an argument stated as a parameter.
sort -su -t ',' -nr -k 2,4
The -t switch allows specification of an alternate column delimiter.
The parameter that follows defines comma as the column delimiter rather than tab.
The -k switch enables one-indexed column numbering.
The parameter that follows indicates sort keys are to span columns 2 through 3. (3 is not a typo).
Word switches
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