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patch

Software
The computer tool patch is a Unix program that updates text files according to instructions contained in a separate file, called a patch file. The patch file is a text file that consists of a list of differences and is produced by running the... Wikipedia
Syntax: patch -bCcEeflNnRstuv -B backup-prefix -D symbol -d directory -F max-fuzz -i patchfile -o out-file -p strip-count -r rej-name -V t|nil|never -x number -z backup-ext --posix origfile patchfile
Initial release: May 24, 1985; 37 years ago
Operating system: Unix and Unix-like, MSX-DOS, Microsoft Windows
Original author(s): Larry Wall