Combine grep and find to restrict search to certain files.

sgrep.sh

#!/bin/sh
# Combine find and grep to search (source) files.
# Just for lazy typers ;)
#
# E.g limit grep to *.h and *.c:
#   sgrep X509_verify_cert .c .h

find_args=""

for arg in $(echo $@ | cut -d' ' -f 2-); do
  if [ -z "$find_args" ]; then
        find_args="-name \*${arg}"
  else
        find_args="$find_args -or -name \*${arg}"
  fi
done

command="grep -Rn '$1' \$(find . -type f -and \( $find_args \))"

eval "$command"