Search all files in give directory

search.sh

#! /bin/sh -
# that also works in any sh, so you don't even need to have or use bash

file_pattern="/Users/ondrej/Downloads/emails/*.dms"
# all uppercase variables should be reserved for environment variables

IFS='' # disable splitting

for f in $file_pattern # here we're not quoting the variable so
                       # we're invoking the split+glob operator.
do
  printf '%s\n' "$f"
  cat '%s\n' "$f" | grep 'From:'
done