Use dig to compare authoritative DNS records with public resolver cache after DNS changes.
Use journalctl to Debug a Failed systemd Service
When a Linux service fails under systemd, the fastest first move is usually not digging through random files in /var/log. Ask systemd what happened, then
Debug HTTP Redirects and Timing with curl
Use curl to follow redirects, inspect the final URL, measure DNS/TLS/TTFB timing, and spot redirect loops or slow origin responses.
Find Directory Sizes in a Folder
Finding the recursive sizes of folders and their contents in summary is easy with the disk usage (du) command. Output will look something like this.
Get the PHP Version at Command Line (3 examples)
To find the PHP version you can combine php and grep. Get the major/minor version only 7.2 Get full version number only 7.2.10 Get the
Find Ubuntu Version at the Command Line
Finding your current version of Ubuntu is simple. Output will look something like this. No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.04.1
A Guide to Finding Files on Linux and Mac
A few creative ways to use the find shell command. Case insensitively look for a file named your_file_name.txt Using wild cards – Case insensitively look
Command to Find Which Shell I’m Currently Using
This will work on any linux/unix variety and mac os. Output will look something like this. -bash
How to get a Summary of Every File Type in a Folder at the Command Line
This command will work on Linux and MacOS. Here we’re running it on our downloads folder to get a summary of every type of file
Listing Files Only With Grep Command
To only show the file names and not a preview of data add the command line param -l to grep. The below example searches in
