gc

• Garbage collection: Clean unreachable commits
• New pack files with along with index files are created
• .git/objects/pack stores .idx and .pack files

# Garbage collection for current git repo
git gc

# Prune
git gc --prune=now --aggressive

# Garbage collection for all existing repos in a directory
find "." \
  -type "d" \
  -name ".git" \
  -exec git --git-dir={} --work-tree=$PWD/{}/.. gc \;