#!/bin/csh
  if ($#argv != 2) then
    echo "Error: improper arguments to chngdocclass:"
    echo "$1" "$2" "$3"
    exit
  else
    set olddocclass  = "\documentclass\[.*\]{.*}"
    set newdocclass  = "$1"
    set file         = $2
    set nlines_found = `grep -c "$olddocclass" $file` # grep option -c == count
    set savstat      = $status
    if ($savstat != 1) then 
      sed s/"$olddocclass"/"$newdocclass"/g $file > sed.out
      if ($status == 0) then 
        echo "Changing file $file"
	echo "  Replaced pattern -> $olddocclass"
        mv sed.out $file
      else
        echo "  Error parsing sed command.\c"
        echo "  No changes made."
	exit
      endif
    endif
    echo "   with new string -> $newdocclass"
  endif