find file changes in all forks of a github repo

fetch-repos.sh

curl -i https://api.github.com/repos/scrooloose/nerdtree/forks |grep -e "git_url" |awk '{gsub(/,/,"");split($2,a,"/"); system("mkdir "a[4]"; cd "a[4]"; git clone " $2);}'

find-file-changes.sh

DIRS=$(find * -type d -name '*nerdtree' -maxdepth 1 -print)
FILECHANGE="plugin/NERD_tree.vim"
for d in $DIRS
do
        cd $d
        git fetch
        BRANCHES=$(git branch -a)
        OBS=$(git branch -r |egrep -v '(HEAD)')
        for ob in $OBS 
        do 
                git checkout -t $ob 2>/dev/null
                bonly=$(echo $ob |awk {'split($0,a,"/"); print a[2]'})
                git checkout $bonly &>/dev/null
                git pull &>/dev/null
                out=$(git log --pretty=format:"%H %ad" $FILECHANGING |head -n1 | xargs -I{} echo `pwd`"("$ob"): "{})
                echo $out
        done

        cd ../..
done

instructions.txt

#1 mkdir $working_dir; echo "modify fetch-repos.sh for your source repo"; cd $working_dir; bash fetch-repos.sh;
#2 echo "modify find-file-changes.sh to use the file you need"; cd $working_dir; bash find-file-changes.sh > all-branch-changes.txt
#3 cat all-branch-changes.txt |sort -k4M,7

This will output a list of fork:branche:commit for a specific file sorted by date of commit;

Note: this is kind of brittle and could break depending on the input data (ie the names of things in the repositories).