UNIX for Dummies Questions & Answers

lhour=$(who | grep $1 | cut -c30,31)
lmin=$(who | grep $1 | cut -c33,34)
chour=$(date | cut -c12,13)
cmin=$(date | cut -c15,16)
hrs=$(($chour - $lhour))
if [ $chour -gt $lhour ]
then
min=$((60 - cmin))
hrs=$(($hrs - 1))
else
min=$(($cmin - $lmin))
fi
echo "$1 is logged in for $hrs hours , $min minutes.";

lhour=$(who | grep $1 | cut -c30,31)
lmin=$(who | grep $1 | cut -c33,34)
chour=$(date | cut -c12,13)
cmin=$(date | cut -c15,16)
if [ $chour -ge $lhour ]
then
hrs=$(($chour - $lhour))
else
hrs=$((($lhour - $chour) + 24))
fi
if [ $cmin -gt $lmin ]
then
min=$(($cmin - $lmin))
else
min=$((60 - ($lmin - $cmin)))
fi
 
echo "$1 has been logged in for $hrs hours and $min minutes.";