Posts
Git Basics: Unstaging Edits and Reverting a Commit
Before undoing a change, check where it lives: the working file, the staging area, or an existing commit. This exercise preserves your edit when unstaging, then reverses a …
October 9, 2026
Git Basics: Staging Files and Making a Commit
Git records project snapshots as commits. The staging area lets you choose what the next snapshot will contain. Start with one file so you can see each step. Run these commands in …
October 9, 2026
Git Basics: Reviewing Staged and Unstaged Changes
A file can contain both staged and unstaged edits. Git’s diff commands answer different questions depending on which two versions they compare. Run these commands in Bash with Git …
October 9, 2026
Git Basics: Finding Changes in Commit History
Git history helps answer what changed and why. A short commit list gives you an overview; a patch shows the actual edit behind a message. Run these commands in Bash with Git 2.28 …
October 9, 2026
Git Basics: Creating a Branch and Merging It
A branch is a movable name for a commit. It lets you develop a change separately, then bring that work into another branch when it is ready. Run these commands in Bash with Git …
October 9, 2026
Linux Basics: Writing a Small Bash Script
A shell script saves a sequence of commands in a text file so you can run it again. This example accepts names as arguments and prints one greeting for each name. Use Bash on …
October 8, 2026
Linux Basics: Understanding File Permission Bits
Linux files have permission bits for their owner, their group, and everyone else. Practice with a file you create yourself before changing permissions on anything important. Use …
October 8, 2026
Linux Basics: Replacing Text with sed
sed can change text as it reads a file and write the result to the terminal. Start by previewing a replacement, then save it to a different file when the result looks right. Use …
October 8, 2026
Linux Basics: Quoting Text and Matching Filenames
Quotes control what Bash treats as one argument. Filename patterns let the shell select several files at once. Knowing the difference helps avoid surprises when names contain …
October 8, 2026
Linux Basics: Filtering and Totaling Fields with awk
awk is useful when you want to select records by a field value or calculate a total. It reads one record at a time, usually one line, and splits that record into fields. Use Bash …
October 8, 2026