Fore. 

perl -le'$x{(split)[0]}++for(`who`);print"$k => $v"while($k,$v)=each%x
+'

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Or 

who|perl -lane'$x{$F[0]}++;END{print"$k => $v"while($k,$v)=each%x}'

[download]

In reply to Re^2: parsing output of UNIX `who` command by Fletch
in thread parsing output of UNIX `who` command by chinamox

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