how to find string from file1 in file2

Shell Programming and Scripting
1

hi;
i am looking for simple search script that find string from file1 in file 2
file 1 contain a loot of string like:

204080111111111
204080222222222
204080333333333

in each row

and i would like to take the first row for example 204080111111111 from file1 and find it in file2 when it will finish(find or not) he will take the next string 204080222222222 from file1 and find if exist in file2 untill we finish all rows in file1

THX

2

If you need descriptive text:

while read record
do
 grep -q "$record" file2 2>/dev/null
 [ $? -eq 0 ] && echo "found $record"
done < file1

Or if you just need the data

grep -f file1 file2