给ruby文件添加#coding:utf-8 如果不存在

utf8.sh

#!/bin/bash 

PATH=/usr/local/system/projects/guoyi
FIND_BIN=/usr/bin/find 
SED_BIN=/bin/sed
CAT_BIN=/bin/cat 
LOG=/tmp/foreach.log 

$CAT_BIN /dev/null > $LOG 
cd $PATH 

function foreach(){
	for f in  `$FIND_BIN . -name "*.rb"`   # 遍历所有.rb文件
	 do 	
		if [ -d $f ] ; then
			foreach $f
		elif [ -f $f ] ;	then  
			line=`$SED_BIN -n '1p' $f` # rb文件的第一行
		  if [[ "$line" =~ "utf-8" ]] ; then  # 注意不能写成 $line , 必须是 "$line" 
                           echo "next"
		  else
		      echo $f
                      echo $f >> $LOG
		      $CAT_BIN $f | $SED_BIN -e '1 i\#coding:utf-8' -i $f
		  fi       
		fi
	done
}

foreach $PATH