patch - apply changes to files patch [-blNR][ -c| -e| -n][-d
dir][-D define][-i patchfile] [-o outfile][-p num][-r
rejectfile][file] The patch utility reads a source (patch) file
containing any of the three forms of difference (diff) listings
produced by the diff utility (normal, context or in the style of
ed) and apply those differences to a file. By default, patch
reads from the standard input. The patch utility attempts to
determine the type of the diff listing, unless overruled by a
-c, -e or -n option. If the patch file contains more than one
patch, patch will attempt to apply each of them as if they came
from separate patch files. (In this case the name of the patch
file must be determinable for each diff listing.) The patch
utility supports the XBD specification, Utility Syntax
Guidelines . The following options are supported: - Save a copy
of the original contents of each modified file, before the
differences are applied, in a file of the same name with the
suffix .orig appended to it. If the file alr