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manswitch grep -o
This will take you to the relevant part of the man page, so you can see the description of the switch underneath.
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Find the usage of a switch with out searching through the entire man page.
Usage: manswitch [cmd] [switch]
manswitch grep silent
In simple words
man <cmd> | grep "\-<switch>"
man grep | grep "\-o"
This is not a standard method but works.
If you can do better, submit your command here.
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