Bash script to filter tests by keyword

run_tests

#!/bin/bash

if [ -n "$1" ]
then
  filter=$1
else  
  echo "Usage: run_tests filtering_keyword"
  exit
fi  

spec_files=$(grep -rl "$1" spec |egrep "_spec.rb$")
echo "Only the following files will be included in this test run because they include the text '$1':"
echo "$spec_files"
echo
script/spec $spec_files