Find lost, unreachable commits

gistfile1.sh

# retrieves commit relative date and message
humanify() {
  while read hash; do
    # echo to trim the new line
    echo $( git log -n 1 ..$hash --format='%ci : %h : %s%n%b' )
  done
}

# show the commits!
git fsck --unreachable | grep -oP '(?<=commit )\w+' | humanify | sort

# It may show something like
# 2011-12-09 18:50:27 +0500 : 4b524f7 : Fixed bug 12345

# In addition you can grep it:
git fsck --unreachable | grep -oP '(?<=commit )\w+' | humanify | sirt | grep 'bug 123'

# once you have found your commit, merge it
git merge 4b524f7