配置方法
建议配置在~/.gitconfig中。
Linux下
[diff]
tool = bc3
[difftool]
prompt = false
[merge]
tool = bc3
[mergetool]
prompt = false
tool = bc3
[difftool]
prompt = false
[merge]
tool = bc3
[mergetool]
prompt = false
cygwin下
[diff]
tool = jellybc3
[difftool]
prompt = false
[difftool "jellybc3"]
#use cygpath to transform cygwin path $LOCAL (something like /tmp/U5VvP1_abc) to windows path, because bc3 is a windows software
cmd = \"/cygdrive/c/program files/beyond compare 3/bcomp.exe\" \"$(cygpath -w $LOCAL)\" \"$REMOTE\"
[merge]
tool = jellybc3
[mergetool]
prompt = false
[mergetool "jellybc3"]
#trustExitCode = true
cmd = \"/cygdrive/c/program files/beyond compare 3/bcomp.exe\" \"$LOCAL\" \"$REMOTE\" \"$BASE\" \"$MERGED\" \"$MERGED\"
tool = jellybc3
[difftool]
prompt = false
[difftool "jellybc3"]
#use cygpath to transform cygwin path $LOCAL (something like /tmp/U5VvP1_abc) to windows path, because bc3 is a windows software
cmd = \"/cygdrive/c/program files/beyond compare 3/bcomp.exe\" \"$(cygpath -w $LOCAL)\" \"$REMOTE\"
[merge]
tool = jellybc3
[mergetool]
prompt = false
[mergetool "jellybc3"]
#trustExitCode = true
cmd = \"/cygdrive/c/program files/beyond compare 3/bcomp.exe\" \"$LOCAL\" \"$REMOTE\" \"$BASE\" \"$MERGED\" \"$MERGED\"
注意：
1、diff工具的命名，如果用bc3，那么git会采用它内置的对bc3的理解来进行调用，不会调用cmd指定的。
Linux上使用内置的比较方便，但cygwin上，$LOCAL不转换为Windows路径，会发现BC只打开了一个文件。
2、注意引号需要转义，否则git调用时会出错。
3、根据上面的推理，如果在Linux下配置，应该只需要配置diff.tool为bc3，并且把bc可执行文件路径加入path环境变量即可（也可以配置在difftool.bc3.path中）。merge也是类似。