My git config

Git Configs

git config --global user.name "Tarcisio Coutinho"
git config --global user.email "tcs5cin@gmail.com"

git config --global color.ui true

git config --global alias.s status
git config --global alias.c checkout
git config --global alias.b branch
git config --global alias.lol log --oneline --graph --decorate

git config --global merge.tool meld
git config --global mergetool.meld.cmd meld '$BASE $LOCAL $REMOTE $MERGED'
git config --global mergetool.meld.trustExitCode false

git config --global diff.tool meld
git config --global difftool.meld.cmd meld '$LOCAL $REMOTE'

Windows merge tool config: (meld.exe needs to be on PATH)

git config --global merge.tool meld
git config --global mergetool.meld.cmd 'meld.exe "$BASE" "$LOCAL" "$REMOTE" "$MERGED"'

git config --global diff.tool meld
git config --global difftool.meld.cmd 'meld.exe "$LOCAL" "$REMOTE"'

Thanks a lot, it works!

For linux I needed to double quote the variables, my ~/.gitconfig looked something like

[merge]
    tool = meld
[mergetool "meld"]
    cmd = meld "$BASE $LOCAL $REMOTE $MERGED"
    trustExitCode = false
[diff]
    tool = meld
[difftool "meld"]
    cmd = meld "$LOCAL $REMOTE"

Nice!