recent-changes.sh

#!/bin/sh

set -e # Bail out as soon as any command fails

git for-each-ref --format='%(objectname) %(refname)' refs/remotes |
# sort | uniq -w20 | # uncomment for deduplication, but this doesn't account for multiple branches pointing to the same commit                     
while read line;
do
    ref=${line%\ *}
    count=$(git log --oneline --since="-1week" $ref | wc -l)
    [ $count -gt 0 ] && printf "%4d\t%s\n" $count "$line"
done