#!/bin/bash
# This script is expecting to be run as:
#   bash -e run-me-with-e.sh
# Therefore, the first failure will cause
# the entire script to abort.

trap die ERR

die()
{
  echo "Failed at line $BASH_LINENO"
  exit 1
}

echo "Checking hostname..."
hostname -f
echo "Checking for null values..."
n=`cat *.txt | grep -c "null" || /bin/true`
if [ "$n" -eq "0" ]; then
  echo "No null values found."
else
  echo "FATAL: Found $n null value(s)":
  grep null *.txt
  echo "Fix these before continuing."
  exit 1
fi
echo "Finished."