If I want to know the meaning of wget -b, I see the manual by man wget, then search the -b option.   -b   --background       Go to background immediately after startup.  If no output file is specified via the -o, output is redirected to wget-log.I want to get the result by a command like man wget -b. (Of course this doesn't work.)Is there a similar way to make it possible?
Is there way to see `man` document only for specified option of a command
man;options
You could redirect the manpage to awk and extact the part:man wget | awk '/^ *-b *.*$/,/^$/{print}'       -b       --background           Go to background immediately after startup.  If no output file is specified via the -o, output is redirected to wget-log.That part is everything that is between a -b and an empty line.