Clone o script do github gist para o seu ambiente
Exemplo:
mkdir ~/bin/
cd /bin
curl https://gist.github.com/hvasconcelos/6081058/raw/d071cf06dddace0178d92f32af59b74038e4bff4/gitistage > gitistage
chmod u+x gitistage
export PATH=$PATH:~/bin/
Código
#!/bin/bash
files=`git status --porcelain | grep -e "^sM" | cut -d " " -f 3`
for file in $files; do
echo "Differences in file"
git diff --color=always $file
read -p "Do you want to stage this file [y/n]" to_stage
if [ "$to_stage" == "y" -o "$to_stage" == "Y" ]; then
echo "Staging file -> $file"
git add $file
fi
done