shell script with "while" loop and numeric test does not work

can someone help me spot the problem here ?

#!/bin/sh

find . -name '*ABC*' > replace_temp.file
num_of_lines=`cat replace_temp.file | wc -l`
i=0
while $i<$num_of_lines
do
   tc=`expr $i + 1`
   line=`tail -$tc replace_temp.file |head -1`
   line1=$line
   sed -e 's/\(.*\)ABC/\1DEF/' $line
   #mv -f $line1 $line   
done 
#rm -f replace_temp.file

i get the error replace.sh: line 6: 20: No such file or directory

purpose of this script: search and replace all files directories containing ABC in their name to DEF

it goes through the lines of find results file from bottom to top so there wont be any problems with dir dependencies (eg changing name of 开发者_StackOverflowone dir will mess up changing the name of it's sub dir)

thanks

while $i<$num_of_lines

should be something like

while [ $i -lt $num_of_lines ]

or if you insist

while (($i < $num_of_lines))

It should be

while [ $i -lt $num_of_lines ]
  do

done

or

while (( $i -lt $num_of_lines ))
  do

done

or

while test $i -lt $num_of_lines
  do

done

You are running an infinite loop, you have never updated $i . Probably you would like to do something like i=$((i+1)) inside the body of the loop, or update $i in any other way.

Use for tc in ((1..$num_of_lines)); do ... ; done