spring + summer

docs/linux.md

@@ -11,6 +11,7 @@
 - [Youtube](#youtube)
 - [Reddit](#reddit)
 - [Linux Commands and Tools](#linux-commands-and-tools)
+- [Makefiles](#makefiles)
 - [Guestfish](#guestfish)
 - [BusyBox](#busybox)
 - [Bash](#bash)
@@ -222,6 +223,9 @@
 - [redhat.com: Linux troubleshooting commands: 4 tools for DNS name resolution problems](https://www.redhat.com/sysadmin/DNS-name-resolution-troubleshooting-tools) Find out what's stopping you from accessing a server, printer, or another network resource with these four Linux troubleshooting commands.
 - [==jvns.ca: A list of new(ish) command line tools | Julia Evans==](https://jvns.ca/blog/2022/04/12/a-list-of-new-ish--command-line-tools/)
 
+## Makefiles
+- [makefiletutorial.com 🌟](https://makefiletutorial.com/) Learn Makefiles With the tastiest examples 
+
 ## Guestfish
 - [Guestfish](https://libguestfs.org/guestfish.1.html)
 - [redhat.com: How to customize VM and cloud images with guestfish](https://www.redhat.com/sysadmin/customize-vm-cloud-images-guestfish) Need to tweak your cloud and virtual machine images to comply with company policies or other requirements? Give guestfish a try.
@@ -261,6 +265,7 @@
 - [linuxhandbook.com: Unusual Ways to Use Variables Inside Bash Scripts](https://linuxhandbook.com/variables-bash-script/)
 - [opensource.com: An introduction to programming with Bash (eBook)](https://opensource.com/downloads/bash-programming-guide)
 - [pythonspeed.com: Please stop writing shell scripts](https://pythonspeed.com/articles/shell-scripts/)
+- [linuxshelltips.com: What’s the Difference Between ${} and $() in Bash](https://www.linuxshelltips.com/difference-between-and-in-bash/)
 
 ## Questions and Answers
 - [redhat.com: 5 questions to ask during your next sysadmin interview](https://www.redhat.com/sysadmin/5-questions-interview)