A small script to find stale branches

find-old-branches.sh

#!/bin/bash

# This is a very naive script, it doesn't do grouping and returns all branches
# I only really care about branches that have not seen commits in two months
#
# I am hoping to find some time to write a tool that can output these reports for me
# In the meantime, I am using this

echo "Merged branches"
for branch in `git branch -r --merged | grep -v HEAD`;do echo -e `git log --no-merges -n 1 --format="%ci, %cr, %an, %ae, "  $branch | head -n 1` \\t$branch; done | sort -r

echo ""
echo "Not merged branches"
for branch in `git branch -r --no-merged | grep -v HEAD`;do echo -e `git log --no-merges -n 1 --format="%ci, %cr, %an, %ae, " $branch | head -n 1` \\t$branch; done | sort -r

In order to filter with awk keeping just branches that have not seen commits in two months
it would suffice prepending %ct (committer date, UNIX timestamp) to the git log fields
then filter and strip the added prefix

Since I want to produce a CSV I did it as follows (for unmerged branches)

for branch in `git branch -r --no-merged | grep -v HEAD`;do
  echo -e $(git log --no-merges -n 1 \
    --format="%ct,%cI,%an,%ae," $branch |                    `# prepend secs since EPOCH as 1st field` \
    head -n 1)$branch; \
done | \
  sort -r | \
  awk -F , '$1 < limit' limit=$(date -d "2 month ago" +%s) | `# split by comma and filter based on 1st field` \
  sed 's/^[0-9]*\,//g'                                       `# strip 1st field now`

It can clearly be optimized based on needs, moving sort after filter and so on

PS: please note here I added comments within ` (backticks) for readability, so in turn I had to replace subshell backticks with the $() syntax.
Also note that this approach leverages some additional comands, namely awk, date and sed

@trntsmn - The term 'grep' is not recognized as a name of a cmdlet, function, script file, or executable program.
=D