Level Verified

Linux Monitor - File Exists Script

Checks for the existence of a specific file on Linux systems. Ideal for script-based monitoring and automated remediation with Level.

Import into Level

Problem overview

Critical files can sometimes be moved, deleted, or corrupted without notice, leading to system failures or unexpected behavior. This script eliminates guesswork by automatically confirming whether a file is present, helping IT Professionals and MSPs catch and fix issues before they escalate.

Bash 100s timeout Runs as Local system Linux 
#!/bin/bash

# This resource is provided as a convenience for Level users. We cannot 
# guarantee it will work in all environments. Please test before deploying 
# to your production environment. We welcome contributions to our community 
# library

# Level Library
# https://level.io/library/script-linux-monitor-file-exists

# Specify the file path to check for existence
file_path="{{FilePath}}"
# -----------------------------------------------------------------------------

# Check if the file exists
if [ -f "$file_path" ]; then
  echo "file exists: $file_path"
else
  echo "file not found: $file_path"
fi

This script verifies if a file, specified through a Level Script Variable, exists on a Linux system. When the file is present, the script echoes a confirmation message; otherwise, it reports that the file is missing. The straightforward design makes it a reliable building block for your monitoring strategies.

You can configure a script-based monitor in Level to run this check on-demand whenever a particular event occurs, such as critical system actions or scheduled maintenance. Alternatively, you can create an Automation in Level with a schedule trigger to run this script regularly, ensuring continuous oversight of essential files.

Use cases

  • Checking for critical configuration files
  • Ensuring log files are available for compliance
  • Monitoring sensitive security files
  • Validating user-created scripts or backups

Recommendations

  • Test in a non-production environment before deploying widely
  • Use a script-based monitor in Level to alert if the file is missing
  • Configure an Automation in Level to run on a schedule for frequent checks
  • Update Script Variables ({{FilePath}}) accurately to avoid false positives
  • Check script output to quickly identify “file not found” messages

Frequently asked questions.

How do I run this script through Level?

Configure it as a resource within your Level environment, then specify the desired file path as a Script Variable.

Why do I need System or Root permissions?

This script needs the ability to check any location, even those restricted to standard users, ensuring comprehensive checks.

What if the script cannot access the file path?

The script will return “file not found” if it can’t confirm file presence. Verify path accuracy and permissions.

Can I automate any remediation steps?

Yes. If the file is missing, pair this script with an automated workflow in Level to replace or restore it immediately.

Is this script suitable for large-scale deployment?

Absolutely. Its lightweight design and easy integration make it a robust tool for broad usage across various systems.

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