Git Merge的常用工具有kdiff3和p4Merge。
下面就Windows系统和OS X系统分别说明如果配置这两种工具。
OS X系统
１、创建一个merge包装脚本,名字叫作extMerge,让它带参数调用p4merge二进制文件
$ sudo vim /usr/local/bin/extMerge
内容为
#!/bin/sh
/Applications/p4merge.app/Contents/MacOS/p4merge $*
２、接着创建diff包装脚本
$ sudo vim /usr/local/bin/extDiff
内容为
#!/bin/sh
[ $# -eq 7 ] && /usr/local/bin/extMerge "$2" "$5"
３、确认这两个脚本是可执行的
$ sudo chmod +x /usr/local/bin/extMerge
$ sudo chmod +x /usr/local/bin/extDiff
４、配置~/.gitconfig
$ git config --global merge.tool extMerge
$ git config --global mergetool.extMerge.cmd \
'extMerge "$BASE" "$LOCAL" "$REMOTE" "$MERGED"'
$ git config --global mergetool.trustExitCode false
$ git config --global diff.external extDiff
或者直接编辑~/.gitconfig文件如下
[merge]
tool = extMerge
[mergetool "extMerge"]
cmd = extMerge "$BASE" "$LOCAL" "$REMOTE" "$MERGED"
trustExitCode = false
[diff]
external = extDiff
如果想替换kdiff3作为默认的merge工具，则修改extMerge脚本，把p4Merge替换成kdiff3
$ sudo vim /usr/local/bin/extMerge
内容为
#!/bin/sh
/Applications/kdiff3.app/Contents/MacOS/kdiff3 $*
５、配置好了之后就可以通过命令行调用工具了。以diff为例
▼一个一个的diff
git diff
git difftool
▼一起diff（kdiff3可以，p4Merge不可以）
git difftool --dir-diff
git difftool -d
Windows系统
git config --global diff.tool p4merge
git config --global difftool.p4merge.cmd "'D:\Program Files\Perforce\p4merge.exe' $LOCAL $REMOTE"
git config --global merge.tool p4merge
git config --global mergetool.p4merge.cmd "'D:\Program Files\Perforce\p4merge.exe' $PWD/$BASE $PWD/$REMOTE $PWD/$LOCAL $PWD/$MERGED"
git config --global mergetool.p4merge.trustExitCode false
git config --global mergetool.keepBackup false
同样，如果想要以kdiff3作为默认的merge工具，可以添加
difftool.kdiff3.cmd
mergetool.kdiff3.cmd
mergetool.kdiff3.trustExitCode false
并把
diff.tool
merge.tool
替换为kdiff3
