首先去官方下载p4merge工具

1.http://www.perforce.com/downloads/complete_list

2.Browse by Platform>选择相应平台系统下载后安装

3.安装完毕后，在安装根目录下会有一个p4merge(.exe)的文件

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Windows配置：

在Git配置中如下配置（请自己写明p4merge路径）：

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[diff]
    tool = p4m
[difftool "p4m"]
    cmd = cmd = \"/cygdrive/d/development/Perforce/p4merge.exe\" \"$(cygpath -w $LOCAL)\" \"$REMOTE\"
[merge]
    tool = p4m
[mergetool "p4m"]
    cmd = \"/cygdrive/d/development/Perforce/p4merge.exe\" \"$BASE\" \"$LOCAL\" \"$REMOTE\" \"$MERGED\"
    trustExitCode = true
    keepBackup = false

注：这里的tool别名不能写为p4merge，因为git在自己的tool-lib命令中，已经添加了这个别名，当别名符合它添加的这个规则时，git首先会调用它自身的规则方法，会导致在win中的路径出现错误

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Linux配置：

1.创建文件/usr/local/bin/extDiff

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#!/bin/bash   
/usr/bin/p4merge "$2"   "$5" 

?2.确保文件可运行：

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$ sudo chmod +x /usr/local/bin/extDiff

?3.编辑~/.gitconfig：

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[diff]  
    external = extDiff  
[gui]  
    spellingdictionary = none  
[mergetool]  
    trustExitCode = false   
[merge]  
    tool = p4merge  
[mergetool "p4merge" ]  
    cmd = p4merge /"$BASE/" /"$LOCAL/" /"$REMOTE/" /"$MERGED/"  

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