Listing each branch and its last revision's date in git

I need to delete old and unmaintained branches from our remote repo. I'm trying to find a way with which to list the remote branches by their last modified date, and I can't.

Does someone know of an easy way to list remote branches this way?

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commandlinefu has 2 interesting propositions:

for k in `git branch | perl -pe s/^..//`; do echo -e `git show --pretty=format:"%Cgreen%ci %Cblue%cr%Creset" $k -- | head -n 1`t$k; done | sort -r

or:

for k in `git branch | sed s/^..//`; do echo -e `git log -1 --pretty=format:"%Cgreen%ci %Cblue%cr%Creset" $k --`t"$k";done | sort

That is for local branches, in a Unix syntax. Using git branch -r , you can similarly show remote branches:

for k in `git branch -r | perl -pe 's/^..(.*?)( ->.*)?$/1/'`; do echo -e `git show --pretty=format:"%Cgreen%ci %Cblue%cr%Creset" $k -- | head -n 1`t$k; done | sort -r

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Michael Forrest mentions in the comments that zsh requires escapes for the sed expression:

for k in git branch | perl -pe s/^..//; do echo -e git show --pretty=format:"%Cgreen%ci %Cblue%cr%Creset" $k -- | head -n 1t$k; done | sort -r 

kontinuity adds in the comments:

If you want to add it your zshrc the following escape is needed.

alias gbage='for k in `git branch -r | perl -pe '''s/^..(.*?)( ->.*)?$/1/'''`; do echo -e `git show --pretty=format:"%Cgreen%ci %Cblue%cr%Creset" $k -- | head -n 1`t$k; done | sort -r'

In multiple lines:

alias gbage='for k in `git branch -r | 
  perl -pe '''s/^..(.*?)( ->.*)?$/1/'''`; 
  do echo -e `git show --pretty=format:"%Cgreen%ci %Cblue%cr%Creset" $k -- | 
     head -n 1`t$k; done | sort -r'

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Here is what I use:

git for-each-ref --sort='-committerdate:iso8601' --format=' %(committerdate:iso8601)%09%(refname)' refs/heads

This is the output:

2014-01-22 11:43:18 +0100       refs/heads/master
2014-01-22 11:43:18 +0100       refs/heads/a
2014-01-17 12:34:01 +0100       refs/heads/b
2014-01-14 15:58:33 +0100       refs/heads/maint
2013-12-11 14:20:06 +0100       refs/heads/d/e
2013-12-09 12:48:04 +0100       refs/heads/f

For remote branches, just use "refs/remotes" instead of "refs/heads":

git for-each-ref --sort='-committerdate:iso8601' --format=' %(committerdate:iso8601)%09%(refname)' refs/remotes

You may want to call "git fetch --prune" before to have the latest information.

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Just to add to the comment by @VonC, take your preferred solution and add it to your ~/.gitconfig alias list for convenience:

[alias]  
    branchdate = !git for-each-ref --sort='-authordate' --format='%(refname)%09%(authordate)' refs/heads | sed -e 's-refs/heads/--'

Then a simple "git branchdate" prints the list for you...

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