UNIX for Beginners Questions & Answers

awk -F":" -v TNR=$(wc -l < passwd.sh) '
BEGIN { NUM_PAGES=TNR/10+1
        print "--------------------------------------------------"
        printf "%-20s %-10s %-3s\n","USERNAME","GUID","DIRECTORY"
        print "--------------------------------------------------" }

!(NR%10) { PAGE++
           printf "--- Page %d of %d ---",PAGE,NUM_PAGES
           getline rc < "-"; system("tput cuu1") }

 #(NR==FNR) {a[$4];next}$3 in a{print $3}
 { printf "%-20s %-10s %-30s\n", $1,$3, $7 } ' group.sh  passwd.sh

awk -F: '
  NR==FNR {
    A[$3]=$1
    next
  }

  $4 in A {
    $4=A[$4]
  }

  {
    printf "%-20s %-10s %-30s\n", $1,$4,$7 
  }
' /etc/group /etc/passwd