Common Bash Error Messages on Linux and macOS (and How to Fix Them)
What common Bash errors mean and how to fix them: command not found, permission denied, bad substitution, ambiguous redirect, and more.
How To Calculate IP Subnets and Netmasks in Linux and macOS?
How to convert between CIDR prefixes and netmasks, and calculate network, broadcast, and usable host ranges with ipcalc, sipcalc, python3, and Bash.
How To Format Date and Time in Linux, macOS, and Bash?
This guide covers how to format date and time in Linux, Mac, and the Bash shell. Includes how to do date shell operations like adding days or comparing dates.
How To Use Option as Meta Key in macOS Terminal?
The Meta Key is a modifier key that can be quite helpful to improve your productivity while working in a terminal and bash. This post cover how to enable from the command line the Meta Key in macOS Terminal.
How To Change Preferences from the Command Line on macOS?
Introduction to the command line 'defaults' on Mac with examples on how to programmatically change user preferences from a shell script and terminal.
How To Upgrade your Bash Version on Mac OS?
MacOS comes with an outdated version Bash which can be limiting in shell scripts. This post explain how to upgrade your Bash version on Mac from the command line.
How to Find which macOS version you are running?
Find out which macOS version you are currently running with the use of two command line tools named respectively system_profiler and sw_vers.
How to flush your DNS Cache on Mac OS X?
Learn how to resolve a bad DNS entry returned by your Mac local cache due to a long TTL DNS and how to purge your Mac OS DNS cache for your specific Mac OS version, all this right from the command line.
Removing ^M in imported Windows files
Learn how to quickly and easily handle files with newline and carriage return between linux, mac, and windows. This post will explain how to remove or replace the often annoying ^M character.