Shell Programming and Scripting

Greetings.

I'm having a time of it with this file. I'm trying to do a script that will take two command line inputs, string1 and string2 and use sed to change the text over files in the current directory. This is what I have so far. It appears to work a little, it does create the filechanges.txt file and string.$$ but the sed piece is not working correctly. I have tried "" and ' ' the sed statement but it still does not want to cooperate.

if [ $# -lt 2 ] ; then

echo "Usage: changeInFiles string1 string2"
exit 1
fi

find . -type f > filechanges.txt

for i in filechanges.txt

do

sed s/$1/$2/g $i >string.$$; cat string.$$ > filechanges.txt

done

rm -rf string.$$

Thanks for any help

looking for something like this

Code:

a=Q13251
b=abc

echo "671320070521330000000003|Q13251|A18741|456787654328977" | sed "s/$a/$b/"

I would like to iterate the sed over all the files in the current directory and replace globally string2 for string1, in all the files. Not sure if I sould be using

for i in $files

or

for file in $files

to run the grep over

Code:

while read file
do
# do sed processing here or something else
done < file_with_list_of_files_to_be_processed