问题描述
在grep的手册中，我们有-o可以打印--only-matching模式.假设echo foobar | grep foo将返回foobar，但是将-o添加到grep只会得到foo.
In the manual for grep, we have -o to print --only-matching patterns. Say echo foobar | grep foo would return foobar, but adding -o to grep would give only foo.
许多grep选项(例如-P，-c等)可以与git结合使用，以搜索Git索引中的所有文件.但是，git grep -o PAT会触发error: unknown switch o'`.
Many grep options like -P, -c, etc, can be used in conjunction with git to search through all files in the Git index. However, git grep -o PAT triggers an error: unknown switcho'`.
如何为Git索引中的每个文件仅打印匹配的字符串?即"git grep -o PAT"
How can I print only matched string for each file in the Git index? i.e. "git grep -o PAT"
我的审判:
for f in `git ls-files`; do grep -o PAT $f; done
推荐答案
git grep 2.18 没有选项-o|--only-matching， git grep 2.19 具有.如果您的版本低于2.19，则不能使用该选项.要使用它，您必须升级.
git grep 2.18 doesn't have the option -o|--only-matching, git grep 2.19 has. If your version is lower than 2.19 you cannot use the option. To use it you have to upgrade.
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