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lab 10 History

Goals

Getting a listing of what changes have been made is the function of the git log command.

Execute:

git log

You should see …

Output:

$ git log
commit 4d578d47c426d4d94fcb3c645fe29c27138f3900
Author: Jim Weirich <jim (at) edgecase.com>
Date:   Fri Nov 1 10:47:28 2019 -0700

    Added a comment

commit dc1d42fa6deb8a5c0abc8694b9f48604ce70d998
Author: Jim Weirich <jim (at) edgecase.com>
Date:   Fri Nov 1 10:47:28 2019 -0700

    Added a default value

commit 9a1c494d033bf09a20ac0b10c32048e89ec5fe3b
Author: Jim Weirich <jim (at) edgecase.com>
Date:   Fri Nov 1 10:47:28 2019 -0700

    Using ARGV

commit 063b40ead4efa2dce10ca893772c83483f0b546b
Author: Jim Weirich <jim (at) edgecase.com>
Date:   Fri Nov 1 10:47:28 2019 -0700

    First Commit

Here is a list of all four commits that we have made to the repository so far.

One Line Histories

You have a great deal of control over exactly what the log command displays. I like the one line format:

Execute:

git log --pretty=oneline

You should see …

Output:

$ git log --pretty=oneline
4d578d47c426d4d94fcb3c645fe29c27138f3900 Added a comment
dc1d42fa6deb8a5c0abc8694b9f48604ce70d998 Added a default value
9a1c494d033bf09a20ac0b10c32048e89ec5fe3b Using ARGV
063b40ead4efa2dce10ca893772c83483f0b546b First Commit

Controlling Which Entries are Displayed

There are a lot of options for selecting which entries are displayed in the log. Play around with the following options:

git log --pretty=oneline --max-count=2
git log --pretty=oneline --since='5 minutes ago'
git log --pretty=oneline --until='5 minutes ago'
git log --pretty=oneline --author=<your name>
git log --pretty=oneline --all

See man git-log for all the details.

Getting Fancy

Here’s what I use to review the changes made in the last week. I’ll add --author=jim if I only want to see changes I made.

git log --all --pretty=format:'%h %cd %s (%an)' --since='7 days ago'

The Ultimate Log Format

Over time, I’ve decided that I like the following log format for most of my work.

Execute:

git log --pretty=format:'%h %ad | %s%d [%an]' --graph --date=short

It looks like this:

Output:

$ git log --pretty=format:'%h %ad | %s%d [%an]' --graph --date=short
* 4d578d4 2019-11-01 | Added a comment (HEAD -> master) [Jim Weirich]
* dc1d42f 2019-11-01 | Added a default value [Jim Weirich]
* 9a1c494 2019-11-01 | Using ARGV [Jim Weirich]
* 063b40e 2019-11-01 | First Commit [Jim Weirich]

Let’s look at it in detail:

This is a lot to type every time you want to see the log. Fortunately we will learn about git aliases in the next lab.

Other Tools

Both gitx (for Macs) and gitk (any platform) are useful in exploring log history.