<div class="gmail_quote">I'm trying to set up check_by_ssh to run a php script on a remote machine that acts as a Nagios plugin. The script runs a few ls commands to figure out the number of directories in a subdirectories, then gives output and return codes accordingly (if it's past a certain threshold, I wantit to error). I've setup an SSH key so that I can ssh into the machine to run the ls command. host1 has the nagios install, so it's where I run check_by_ssh from. host2 is where the php script is installed. Here's the command_line definition in the command definition /usr/local/nagios/libexec/check_by_ssh -H host2 -l user -C "$ARG1$"' Here's the check_command in the service definition check_by_ssh_host2!/usr/local/bin/php /root/scripts/php_script.php I changed the php script to just do echo "DIRS CRITICAL\n"; return 2; But all I get is "(null)" in the email sent from nagios, which implies to me that it's not even running the script. When I run the libexec/check_by_ssh line from the command line, it correctly works. How can I debug why it isn't working within the Nagios framework? As a gut check, how do I check what $USER the script is running as? I'm assuming "nagios" currently, which is how I've set up the SSH keys. Thanks for any help! Waynn </div>