Backtick or back quote

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examples/script/backtick.txt

$ who
gabor    console  Apr 21 10:06 
gabor    ttys000  Apr 21 10:06 
gabor    ttys001  Apr 21 10:06 

$ who | wc
       3      15      96

$ who | wc -l
       3
$ v=`who | wc -l`

$ echo $v
3