You can select a different diff program here. On Solaris the standard diff program does not support all the options that the GNU version does. This way you can select that version.
在此可以选择另外一个 diff 程序。 在 Solaris 上, 标准 diff 程序不支持 GNU 版本的所有选项, 因此可以选择 GNU 版本 。
Subversion uses its internal diff engine, which produces unified diff format, by default. If you want diff output in a different format, specify an external diff program using - diff-cmd and pass any additional flags that it needs via the - extensions (-x) option. For example, you might want Subversion to defer its difference calculation and display to the GNU diff program, asking that program to print local modifications made to the file foo.c in context diff format (another flavor of difference format) while ignoring changes made only to the case of the letters used in the file's contents
Note that Subversion runs the diff program once per modified file covered by the Subversion operation, so if your program runs in an asynchronous fashion (or is "backgrounded"), you might have several instances of it all running simultaneously.
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