Some commands to get git commit log statistics for a repository on the command line.

git-commit-log-stats.md

git commit stats

Commands to get commit statistics for a Git repository from the command line -
using git log, git shortlog and friends.

---

List repository contributors by author name (sorted by name):

$ git log --format='%aN' | sort -u 

Example output:

Jane Bar
John Foo
Steve Baz

---

List total commits by author (sorted by commit count):

$ git shortlog -sn

Example output:

136 Jane Bar
 41 John Foo
 17 Steve Baz

Ignore merge commits:

$ git shortlog -sn --no-merges

Example output:

121 Jane Bar
 36 John Foo
 14 Steve Baz

Even though the --no-merges option is not documented for git shortlog, it works exactly as defined for git log.

---

List file change stats by author:

$ git log --author="Vorname Nachname" --pretty=tformat: --numstat | awk '{inserted+=$1; deleted+=$2; delta+=$1-$2; ratio=deleted/inserted} END {printf "Commit stats:\n- Lines added (total)....  %s\n- Lines deleted (total)..  %s\n- Total lines (delta)....  %s\n- Add./Del. ratio (1:n)..  1 : %s\n", inserted, deleted, delta, ratio }' -

Example output:

Commit stats:
- Lines added (total)....  4625
- Lines deleted (total)..  836
- Total lines (delta)....  3789
- Add./Del. ratio (1:n)..  1 : 0.180757

Include file count:

$ git log --shortstat --author="Vorname Nachname" | grep -E "fil(e|es) changed" | awk '{files+=$1; inserted+=$4; deleted+=$6; delta+=$4-$6; ratio=deleted/inserted} END {printf "Commit stats:\n- Files changed (total)..  %s\n- Lines added (total)....  %s\n- Lines deleted (total)..  %s\n- Total lines (delta)....  %s\n- Add./Del. ratio (1:n)..  1 : %s\n", files, inserted, deleted, delta, ratio }' -

Example output:

Commit stats:
- Files changed (total)..  439
- Lines added (total)....  4625
- Lines deleted (total)..  836
- Total lines (delta)....  3789
- Add./Del. ratio (1:n)..  1 : 0.180757

Ignore merge commits:

Note: Both commands above also count merge commits. But to ignore them, one can simply use the --no-merges option again:

$ git log --author="Vorname Nachname" --pretty=tformat: --numstat --since="1 Jan, 2015" | awk ...
# or
$ git log --shortstat --author="Vorname Nachname" --since="1 Jan, 2015" | grep -E ...

Filter stats by date:

You can filter the output of the above commands, for example, by adding --until or --since or --before:

$ git log --author="Vorname Nachname" --pretty=tformat: --numstat --since="1 Jan, 2015" | awk ...
# or
$ git log --shortstat --author="Vorname Nachname" --since="1 Jan, 2015" | grep -E ...

---

I wanted to suggest an additional option through a tool called mergestat to also display some of these stats (full disclosure, I'm the creator/maintainer), via a SQL interface.

For example, a SQL query like the following will show commit stats by author, similar to the List file change stats by author section above.

SELECT
    author_name,
    author_email,
    count(*) AS commit_count,
    count(DISTINCT file_path) AS files_changed,
    sum(additions) AS total_additions,
    sum(deletions) AS total_deletions,
    sum(additions - deletions) AS delta,
    round(avg(deletions/additions), 2) AS avg_ratio
FROM commits, stats('', commits.hash)
GROUP BY author_name, author_email
ORDER BY commit_count DESC

It can be amended to filter out merge commits or to limit the date range via WHERE clause conditions:

SELECT
    (...)
FROM commits, stats('', commits.hash)
WHERE
    parents < 2 -- ignore merge commits
    AND author_when > date('now', '-90 days') -- only look at commits made in the past 90 days
GROUP BY author_name, author_email
ORDER BY commit_count DESC

+-------------+--------------+--------------+---------------+-----------------+-----------------+--------+-----------+
| AUTHOR_NAME | AUTHOR_EMAIL | COMMIT_COUNT | FILES_CHANGED | TOTAL_ADDITIONS | TOTAL_DELETIONS | DELTA  | AVG_RATIO |
+-------------+--------------+--------------+---------------+-----------------+-----------------+--------+-----------+
| <removed>   | <removed>    | 732          | 264           | 26705           | 17245           | 9460   | 1.2       |
+-------------+--------------+--------------+---------------+-----------------+-----------------+--------+-----------+
| <removed>   | <removed>    | 140          | 84            | 251393          | 6863            | 244530 | 0.3       |
+-------------+--------------+--------------+---------------+-----------------+-----------------+--------+-----------+
| <removed>   | <removed>    | 85           | 32            | 2201            | 676             | 1525   | 2.1       |
+-------------+--------------+--------------+---------------+-----------------+-----------------+--------+-----------+
| <removed>   | <removed>    | 29           | 23            | 2752            | 144             | 2608   | 0.72      |
+-------------+--------------+--------------+---------------+-----------------+-----------------+--------+-----------+
| <removed>   | <removed>    | 26           | 25            | 506             | 12              | 494    | 0.04      |
+-------------+--------------+--------------+---------------+-----------------+-----------------+--------+-----------+
| <removed>   | <removed>    | 15           | 12            | 980             | 17              | 963    | 0.07      |
+-------------+--------------+--------------+---------------+-----------------+-----------------+--------+-----------+
| <removed>   | <removed>    | 5            | 5             | 15              | 15              | 0      | 1         |
+-------------+--------------+--------------+---------------+-----------------+-----------------+--------+-----------+
| <removed>   | <removed>    | 4            | 3             | 378             | 47              | 331    | 0         |
+-------------+--------------+--------------+---------------+-----------------+-----------------+--------+-----------+
| <removed>   | <removed>    | 1            | 1             | 1               | 1               | 0      | 1         |
+-------------+--------------+--------------+---------------+-----------------+-----------------+--------+-----------+

There are some other tables available as well, and since the input is just SQL, it's fairly flexible to tailor a query to meet specifically what you're looking for (break out by file name, filter out certain authors, etc)

For "List file change stats by author" it's better calc ratio at the end. If first commit has 0 inserted lines it will fail for divide by zero. Consider the following:

Yes, that's better, otherwise I get a
"awk: cmd. line:1: (FILENAME=- FNR=1) fatal: division by zero attempted"

Is there a simple way to get the same results as 'git log stats' but leave out all the comments? I need the lines added and deleted, but not the comments and our repos are old with a lot of commits and some of the comments are absolutely massive.