Shell Programming and Scripting

awk -F: '{print $1}' /etc/passwd | xargs finger -s | cut -c11-28 | uniq

users | xargs grep /etc/passwd | cut -d: -f5 | sort -fd | uniq

usrs=`users | sort`
for i in `echo $usrs`
do
grep $i /etc/passwd | awk -F \: '{print $1}'
done

usrs=`who | cut -d" " -f1 | sort -df | uniq`
for i in $usrs
do
  grep $i /etc/passwd | awk -F \: '{print $5}'
done

if [ -f tmp.txt ]
then
  rm -f tmp.txt
fi
usrs=`users`
for i in $usrs
do
  grep $i /etc/passwd | awk -F \: '{print $5}' >> tmp.txt
done
sort tmp.txt 
rm tmp.txt

who | while read username junk ; do awk -F: '($1 == "'$username'") {print $5}' /etc/passwd ; done | sort -u