Bash

Use iptables string matching and the recent module to drop connections from abusive bots that exceed a request threshold within a short window.

A quick bash one-liner to identify which directories are consuming the most inodes on a Linux system, helping you pinpoint the source of ‘No space left on device’ errors when disk space still appears available.

A quick reference for using find with -mtime and -mmin to locate files by how long ago they were last modified, including the common off-by-one confusion around the +1 flag.

A quick one-liner to identify the ten largest files or directories under any path. Useful when disk space is tight and you need to find what is eating your storage.

A quick way to list every port a process is listening on, using lsof and a simple grep filter. Handy for troubleshooting connectivity issues or auditing what services are exposed on a host.

A quick reference for the cut command, covering how to split text by a delimiter and extract specific fields. Useful for parsing CSV, log files, and other delimited data from the command line.