Bash script to delete old js bundles

wipe_old_builds.sh

#!/usr/bin/env bash

if [ $# -ne 1 ]
  then
    echo "Usage: ./wipe_old_builds.sh /path/to/builds/directory"
    exit 1
fi

cd $1
if [ $? -ne 0 ]
  then
    echo "Failed to CD into $1, exiting.."
    exit 1
fi

echo "Deleting old builds from $1"
ls -t *.js* | tail -n +7 | xargs rm --
if [ $? -eq 0 ]
  then
    echo "Old builds have been deleted."
    exit 0
fi

exit 1