Hi, We created a ticket as https://bugs.busybox.net/show_bug.cgi?id=11981
If a filename is not given, busybox patch uses the newname in the line +++. This does not align with the posix filename determination rule. https://pubs.opengroup.org/onlinepubs/9699919799/utilities/patch.html The posix filename determination said: If the type of diff is context, the patch utility shall delete the pathname components (as specified by the -p option) from the filename on the line beginning with "---" (if copied context) or "+++" (if unified context), then test for the existence of this file relative to the current directory (or the directory specified with the -d option). If the file exists, the patch utility shall use this filename. Steps to Reproduce: $ echo test > test.txt $ echo updated_test > utest.txt $ diff -u test.txt utest.txt --- test.txt +++ utest.txt @@ -1 +1 @@ -test +updated_test $ diff -u test.txt utest.txt > test.patch $ busybox patch < test.patch patching file utest.txt Hunk 1 FAILED 1/1. -test +updated_test Expected behavior with GNU patch --posix: $ patch --posix < test.patch patching file test.txt Best regards Shuang Liu Engineering Software Multimedia (ADITG/ESM) _______________________________________________ busybox mailing list busybox@busybox.net http://lists.busybox.net/mailman/listinfo/busybox