Squash some git pieces

snippets/git/s/automatic-push-upstream.md

@@ -1,5 +1,5 @@
 ---
-title: "Tip: Automate upstream branch creation"
+title: "Tip: Automate Git upstream branch creation"
 shortTitle: Automate upstream branch creation
 type: tip
 language: git

snippets/git/s/update-commit-message-or-contents.md

@@ -0,0 +1,49 @@
+---
+title: Change the last commit's message or contents in Git
+shortTitle: Amend last commit
+type: story
+language: git
+tags: [commit]
+author: chalarangelo
+cover: greek-coffee
+excerpt: Learn how to effortlesly amend the last commit's message or contents using Git and fix any mistakes you might have made.
+dateModified: 2023-05-23T21:10:59+03:00
+---
+
+Have you ever wanted to change the last commit's message or contents? Maybe you forgot to add a file, or you misspelled something in the commit message. Whatever the reason, Git has you covered with the `--amend` option for the `git commit` command.
+
+### Change the last commit's message
+
+If you only want to change the last commit's message, you can use `--amend` and simply add the `-m` option followed by the new message. This will replace the last commit's message with the new one.
+
+```shell
+# Syntax: git commit --amend -m <message>
+
+git add .
+git commit -m "Fix the network bug"
+# Creates the commit: 3050fc0 Fix network bug
+
+git commit --amend -m "Fix the network bug"
+# The last commit's message is now "Fix the network bug"
+# This also changes its SHA-1 checksum
+```
+
+### Change the last commit's contents
+
+If you want to change the last commit's contents, you can use `--amend` after staging the changes you want to add to the last commit. This will add any staged changes to the last commit, without changing its message.
+
+If you want to keep the same commit message and only add the staged changes, you can use `--no-edit` to prevent Git from opening the default editor to change the commit message.
+
+```shell
+# Syntax: git commit --amend --no-edit
+
+git add .
+git commit -m "Fix the network bug"
+# Creates the commit: 3050fc0 Fix network bug
+
+# Edit or add files
+git add .
+git commit --amend --no-edit
+# The last commit includes the edited/added files
+# This also changes its SHA-1 checksum
+```

snippets/git/s/view-commits-summary.md

@@ -1,23 +1,36 @@
 ---
-title: View a short summary of commits
-type: snippet
+title: View a short summary of Git commits
+shortTitle: Short commits summary
+type: story
 language: git
 tags: [repository,commit]
+author: chalarangelo
 cover: dark-city
-dateModified: 2021-04-13T21:10:59+03:00
+excerpt: Learn how to view a short summary of your Git commits using git log.
+dateModified: 2023-05-23T21:10:59+03:00
 ---
 
-Prints a short summary of all commits.
+One of the most common things you might need to do when working with Git is to view a short summary of your commits. While `git log` is the go-to command for this, it can be a bit verbose at times. Luckily, it provides a plethora of options to help you customize its output.
 
-- Use `git log --oneline` to list a short summary of all commits.
+### Short summary of all commits
+
+One of these is `--oneline`, which is actually a shorthand for `--pretty=oneline --abbrev-commit`. It prints a short summary of all commits, with each commit being printed on a single line.
 
 ```shell
 git log --oneline
+# d540ba1 Merge network bug fix
+# 3050fc0 Fix network bug
+# c191f90 Initial commit
 ```
 
+Notice the short, 7-character commit identifiers. This is because of the `--abbrev-commit` option, which abbreviates the commit SHA-1 checksum to 7 characters. This shorter string is enough to uniquely identify a commit.
+
+### Short summary of commits without merges
+
+Other options can be used in conjunction with `--oneline` to further customize the output. For example, you can use `--no-merges` to exclude merge commits from the output.
+
 ```shell
-git log --oneline
-# d540ba1ab Merge network bug fix
-# 3050fc0de Fix network bug
-# c191f90c7 Initial commit
+git log --oneline --no-merges
+# 3050fc0 Fix network bug
+# c191f90 Initial commit
 ```

snippets/git/s/view-undo-history.md

@@ -1,5 +1,6 @@
 ---
-title: View "undo" history
+title: View Git "undo" history
+shortTitle: Undo history
 type: story
 language: git
 tags: [repository,branch]
@@ -15,7 +16,6 @@ To view you "undo" history, you can use `git reflog`, which displays the git ref
 
 ```shell
 git reflog
-
 # b6a4f9d6ff9 (HEAD -> patch-1, origin/patch-1) HEAD@{0}: Update docs
 # 3050fc0de HEAD@{1}: rebase -i (finish): returning to refs/heads/patch-1
 # 3050fc0de HEAD@{2}: rebase -i (pick): Fix network bug