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--- git_commit [2018/06/26 10:34]
rpjday [Template]
+++ git_commit [2019/02/28 12:34]
rpjday [git diff --cached --stat]
@@ Line 1: / Line 1: @@
 ===== Overview =====
-Miscellaneous notes on ''git commit''.
+Miscellaneous notes on ''git commit'', using the Linux kernel source as an example.
-===== Template =====
+===== SYNOPSIS =====
-This might be worth setting at the system level.
+<code>
+git commit [-a | --interactive | --patch] [-s] [-v] [-u<mode>] [--amend]
+           [--dry-run] [(-c | -C | --fixup | --squash) <commit>]
+           [-F <file> | -m <msg>] [--reset-author] [--allow-empty]
+           [--allow-empty-message] [--no-verify] [-e] [--author=<author>]
+           [--date=<date>] [--cleanup=<mode>] [--[no-]status]
+           [-i | -o] [-S[<keyid>]] [--] [<file>...]
+</code>
+===== Examining what is about to be committed =====
+==== git status ====
+See which files are staged for committing:
 <code>
-$ git config --global commit.template ~/.gitmessage.txt
+$ git status
+On branch master
+Your branch is up to date with 'origin/master'.
+Changes to be committed:
+  (use "git reset HEAD <file>..." to unstage)
+	modified:   MAINTAINERS
+	modified:   README
+Changes not staged for commit:
+  (use "git add <file>..." to update what will be committed)
+  (use "git checkout -- <file>..." to discard changes in working directory)
+	modified:   Makefile
+$
 </code>
-Example ''~/.gitmessage.txt'':
+==== git diff --cached ====
+To see the entire difference about to be committed:
+<code>
+$ git diff --cached                            [or --staged]
+diff --git a/MAINTAINERS b/MAINTAINERS
+index 41ce5f4ad838..202d67e2facb 100644
+--- a/MAINTAINERS
++++ b/MAINTAINERS
+@@ -1,4 +1,4 @@
+-
++New stuff in MAINTAINERS
+        List of maintainers and how to submit kernel changes
+diff --git a/README b/README
+index 669ac7c32292..3db2a5b35089 100644
+--- a/README
++++ b/README
+@@ -1,3 +1,5 @@
++New stuff in README
++
+ Linux kernel
+ ============
+</code>
+==== git diff --cached --stat ====
+For a histogram-style summary, add ''%%--%%stat'':
+<code>
+$ git diff --cached --stat
+ MAINTAINERS | 2 +-
+ README      | 2 ++
+files changed, 3 insertions(+), 1 deletion(-)
+$
+</code>
+===== Popular commit options =====
+==== "-m" ====
+<code>
+-m <msg>, --message=<msg>
+    Use the given <msg> as the commit message. If multiple -m
+    options are given, their values are concatenated as
+    separate paragraphs.
+    The -m option is mutually exclusive with -c, -C, and -F.
+</code>
+==== "-a" ====
+<code>
+-a, --all
+    Tell the command to automatically stage files that have
+    been modified and deleted, but new files you have not told
+    Git about are not affected.
+</code>
+===== Defining a commit template =====
+You can define a more informative commit //template// message, say in a personal ''~/.gitmessage.txt'' file:
 <code>
@@ Line 20: / Line 110: @@
 [Ticket: X]
+</code>
+and have it used in one of two ways when committing.
+First, manually at the command line:
+<code>
+-t <file>, --template=<file>
+    When editing the commit message, start the editor with the
+    contents in the given file. The commit.template
+    configuration variable is often used to give this option
+    implicitly to the command. This mechanism can be used by
+    projects that want to guide participants with some hints on
+    what to write in the message in what order. If the user
+    exits the editor without editing the message, the commit is
+    aborted. This has no effect when a message is given by
+    other means, e.g. with the -m or -F options.
+</code>
+As a second option, set it once as a configuration setting:
+<code>
+$ git config --global commit.template ~/.gitmessage.txt
 </code>

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