Bash multiple files processing

Question

I have a file named data_file with data: london paris newyork italy...50 more items

Have a directory with over 75 files, say dfile1, dfie2...afle75 in which i am perform

Answer 1

You could use grep's q option to stop searching after the first match and f option to obtain the patterns from a file:

for f in $(find . -type f); do
    if $(grep -qf data_file "$f"); then
        ...
    fi
done

If data_file contains:

xxx
yyy
zzz

then grep -qf "$data_file" "$f" evaluates to true if either xxx, yyy, or zzz are found in $f.