列出文件行号的shell脚本

#!/bin/sh
# filename: line_file.sh
function list_num ()
{
  FILENAME=$1
  if [ $# -ne 1 ];then
     echo "USEAGE: list_num arg ,arg is a chanchu file name"
     return 1
  fi
  LOOP=1
  while read LINE
  do
  echo "$LOOP:  $LINE"
  LOOP=`expr $LOOP + 1`
  done <$FILENAME
}