git-gcv

#!/bin/bash

# This script shows the space used by a git repository before and after running 'git gc'.
# Put it in your ~/bin/ directory or in /usr/local/bin/.
# git even support it as a sub-command, ie: git gcv (no dash required)

function du()
{
	/usr/bin/du -bs $1 | awk '{print $1}'
}

B="$(du .git)"
echo -e "\e[1;34m# $(printf "%'d" $B)\e[0m" &&
git gc &&
A="$(du .git)" &&
D="$(printf "%'d" $((B - A)) )"
if (( (B-A) < 0 )); then
    C='\e[1;31m'
else
    C='\e[1;32m'
fi
echo -e "\e[1;34m# $(printf "%'d" $A) = $C$D\e[0m"