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User Commands patch(1)
NAME
patch - apply changes to files
SYNOPSIS
patch [-blNR] [-c | -e | -n | -u] [-d dir] [-D define] [-
i patchfile] [-o outfile] [-p num] [-r rejectfile] [file]
DESCRIPTION
The patch command reads a source (patch) file containing any
of the three forms of difference (diff) listings produced by
the diff(1) command (normal, context or in the style of
ed(1)) and apply those differences to a file. By default,
patch reads from the standard input.
patch 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.)
OPTIONS
The following options are supported:
-b Saves 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
already exists, it will be overwritten. If
multiple patches are applied to the same
file, the .orig file will be written only
for the first patch. When the -o outfile
option is also specified, file.orig will not
be created but, if outfile already exists,
outfile.orig will be created.
-c Interprets the patch file as a context
difference (the output of the command diff
when the -c or -C options are specified).
-d dir Changes the current directory to dir before
processing as described in EXTENDED DESCRIP-
TION.
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User Commands patch(1)
-D define Marks changes with the C preprocessor con-
struct:
#ifdef define
...
#endif
The option-argument define will be used as the differentiat-
ing symbol.
-e Interprets the patch file as an ed script,
rather than a diff script.
-i patchfile Reads the patch information from the file
named by the path name patchfile, rather
than the standard input.
-l (The letter ell.) Causes any sequence of
blank characters in the difference script to
match any sequence of blank characters in
the input file. Other characters will be
matched exactly.
-n Interprets the script as a normal differ-
ence.
-N Ignores patches where the differences have
already been applied to the file; by
default, already-applied patches are
rejected.
-o outfile Instead of modifying the files (specified by
the file operand or the difference listings)
directly, writes a copy of the file refer-
enced by each patch, with the appropriate
differences applied, to outfile. Multiple
patches for a single file will be applied to
the intermediate versions of the file
created by any previous patches, and will
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User Commands patch(1)
result in multiple, concatenated versions of
the file being written to outfile.
-p num For all path names in the patch file that
indicate the names of files to be patched,
deletes num path name components from the
beginning of each path name. If the path
name in the patch file is absolute, any
leading slashes are considered the first
component (that is, -p 1 removes the leading
slashes). Specifying -p 0 causes the full
path name to be used. If -p is not speci-
fied, only the basename (the final path name
component) is used.
-R Reverses the sense of the patch script. That
is, assumes that the difference script was
created from the new version to the old ver-
sion. The -R option cannot be used with ed
scripts. patch attempts to reverse each por-
tion of the script before applying it.
Rejected differences will be saved in
swapped format. If this option is not speci-
fied, and until a portion of the patch file
is successfully applied, patch attempts to
apply each portion in its reversed sense as
well as in its normal sense. If the attempt
is successful, the user will be prompted to
determine if the -R option should be set.
-r rejectfile Overrides the default reject file name. In
the default case, the reject file will have
the same name as the output file, with the
suffix .rej appended to it. See Patch Appli-
cation.
-u Interprets the patch file as a unified con-
text difference, that is, the output of the
command diff when the -u or -U options are
specified.
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User Commands patch(1)
OPERANDS
The following operand is supported:
file A path name of a file to patch.
USAGE
The -R option will not work with ed scripts because there is
too little information to reconstruct the reverse operation.
The -p option makes it possible to customize a patch file to
local user directory structures without manually editing the
patch file. For example, if the file name in the patch file
was /curds/whey/src/blurfl/blurfl.c:
o Setting -p 0 gives the entire path name unmodified.
o Setting -p 1 gives:
curds/whey/src/blurfl/blurfl.c
o Without the leading slash, -p 4 gives:
blurfl/blurfl.c
o Not specifying -p at all gives:
blurfl.c
When using -b in some file system implementations, the sav-
ing of a .orig file may produce unwanted results. In the
case of 12-, 13-, or 14-character file names, on file sys-
tems supporting 14-character maximum file names, the .orig
file will overwrite the new file.
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment
variables that affect the execution of patch: LANG, LC_ALL,
LC_CTYPE, LC_MESSAGES, LC_TIME, and NLSPATH.
OUTPUT FILES
The output of patch the save files (.orig suffixes) and the
reject files (.rej suffixes) will be text files.
EXTENDED DESCRIPTION
A patch file may contain patching instructions for more than
one file. File names are determined as specified in Patch
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User Commands patch(1)
Determination. When the -b option is specified, for each
patched file, the original will be saved in a file of the
same name with the suffix .orig appended to it.
For each patched file, a reject file may also be created as
noted in Patch Application. In the absence of an -r option,
the name of this file will be formed by appending the suffix
.rej to the original file name.
Patch File Format
The patch file must contain zero or more lines of header
information followed by one or more patches. Each patch must
contain zero or more lines of file name identification in
the format produced by diff -c, and one or more sets of diff
output, which are customarily called hunks.
patch recognizes the following expression in the header
information:
Index:pathname The file to be patched is named
pathname.
If all lines (including headers) within a patch begin with
the same leading sequence of blank characters, patch will
remove this sequence before proceeding. Within each patch,
if the type of difference is context, patch recognizes the
following expressions:
*** filename timestamp
The patches arose from filename.
--- filename timestamp
The patches should be applied to filename.
Each hunk within a patch must be the diff output to change a
line range within the original file. The line numbers for
successive hunks within a patch must occur in ascending
order.
File Name Determination
If no file operand is specified, patch performs the follow-
ing steps to obtain a path name:
1.
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User Commands patch(1)
If the patch contains the strings *** and ---, patch
strips components from the beginning of each path name
(depending on the presence or value of the -p option),
then tests for the existence of both files in the
current directory (or directory specified with the -d
option).
2. If both files exist, patch assumes that no path name can
be obtained from this step. If the header information
contains a line with the string Index:, patch strips
components from the beginning of the path name (depend-
ing on -p), then tests for the existence of this file in
the current directory (or directory specified with the
-d option).
3. If an SCCS directory exists in the current directory,
patch will attempt to perform a get -e SCCS/s.filename
command to retrieve an editable version of the file.
4. If no path name can be obtained by applying the previous
steps, or if the path names obtained do not exist, patch
will write a prompt to standard output and request a
file name interactively from standard input.
Patch Application
If the -c, -e, -n, or -u option is present, patch will
interpret information within each hunk as a context differ-
ence, an ed difference, a normal difference, or a unified
context difference, respectively. In the absence of any of
these options, patch determines the type of difference based
on the format of information within the hunk.
For each hunk, patch begins to search for the place to apply
the patch at the line number at the beginning of the hunk,
plus or minus any offset used in applying the previous hunk.
If lines matching the hunk context are not found, patch
scans both forwards and backwards at least 1000 bytes for a
set of lines that match the hunk context.
If no such place is found and it is a context difference,
then another scan will take place, ignoring the first and
last line of context. If that fails, the first two and last
two lines of context will be ignored and another scan will
be made. Implementations may search more extensively for
installation locations.
If no location can be found, patch will append the hunk to
the reject file. The rejected hunk will be written in
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User Commands patch(1)
context-difference format regardless of the format of the
patch file. If the input was a normal or ed -style differ-
ence, the reject file may contain differences with zero
lines of context. The line numbers on the hunks in the
reject file may be different from the line numbers in the
patch file since they will reflect the approximate locations
for the failed hunks in the new file rather than the old
one.
If the type of patch is an ed diff, the implementation may
accomplish the patching by invoking the ed command.
EXIT STATUS
The following exit values are returned:
0 Successful completion.
1 One or more lines were written to a reject file.
>1 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcsu |
|_____________________________|_____________________________|
| Interface Stability | Standard |
|_____________________________|_____________________________|
SEE ALSO
ed(1), diff(1), attributes(5), environ(5), standards(5)
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© 1994 Man-cgi 1.15, Panagiotis Christias <christia@theseas.ntua.gr>