if ( $#argv > 2 ) then
    echo "Error: 'Too much arguments given'" > /dev/stderr
    echo "Error: 'For help use -h switch'" > /dev/stderr
    exit
endif

set nonomatch=1
set group = 0

#get arguments
switch ($1)
case -h:
    echo 'zadanie1.csh (C) Martin Kotucek'
    echo ''
    echo 'Usage: zadanie1.csh [-h] [-g <group>]'
    echo ' -h: Prints out help.'
    echo ' -g <group>: Prints out only the members of the <group>.'
    exit
  breaksw
case -g:
    if(`echo $2 | egrep ^"[0-9]+"$` < 1) then
        set group = $2
    else
        echo "Error: 'Bad group'" > /dev/stderr
        exit
    endif
  breaksw
case "":
  breaksw
default:
    echo "Error: 'Bad argument'" > /dev/stderr
    exit
  breaksw
endsw

#code
set readf=`cat /etc/passwd.2001 | tr " " "_" | tr "\n" " "`
foreach line ($readf)
    set usrname = `echo $line | cut -d ":" -f1`
    set occur = `last | grep -c "$usrname"`

    if ( $occur < 1 ) then
        set realnam = `echo $line | cut -d ":" -f5 | tr -d "," | tr "_" " "`
        set usergrp = `echo $line | cut -d ":" -f3`
        if( $group == 0 || $group == $usergrp ) then
            echo "Output: '$usrname $usergrp $realnam'"
        endif
    endif
end
exit