2022-06-04 02:12:12 +00:00
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.TH PATCH 1
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.SH NAME
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2022-06-04 02:13:58 +00:00
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patch \- apply patches
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2022-06-04 02:12:12 +00:00
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.SH SYNOPSIS
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.B patch
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[
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2022-06-04 02:13:58 +00:00
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.B -R
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2022-06-04 02:12:12 +00:00
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]
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[
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.B -p
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.I nstrip
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]
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[
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.I patch ...
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]
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.SH DESCRIPTION
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.I Patch
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scans its input for a sequence of patches, and applies them, printing the list of changed files.
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When an applied patch does not match precisely,
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.I patch
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will scan the input file for matching context, applying the patch up to 250 lines away from
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its original location.
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If a hunk does not apply, then the file is left untouched.
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.PP
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The following options are supported:
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.TP
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.B -R
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Reverse direction of the patch. Additions become removals,
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and the new and old file names are swapped.
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.TP
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.BI -p \ nstrip
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Remove the prefix containing
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.I nstrip
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leading slashes from each file path in the diff file.
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.SH INPUT FORMAT
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A patch begins with a patch header, and is followed by a sequence of one or more hunks.
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All lines before a patch header or after the last hunk of a patch are comments,
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and are ignored by patch. A patch header is a sequence of 2 lines in the following
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format:
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.IP
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.EX
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--- oldfile [trailing text]
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+++ newfile [trailing text]
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.EE
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.PP
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A hunk must immediately follow a patch header or another hunk.
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It begins with a header line in the following format:
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.IP
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.EX
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@@ -count,addr +count,addr @@
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.EE
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.PP
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And contains a sequence of lines beginning with a
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.LR - ,
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.LR + ,
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or space characters.
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A
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.L -
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indicates that the line is to be removed from the old file.
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A
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.L +
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indicates that the line is to be inserted into the new file.
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A space indicates that the line is context.
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It will be copied unchanged from the old file to the new file.
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.PP
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If the old file is
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.LR /dev/null ,
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the patch indicates a file creation.
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If the new file is
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.LR /dev/null ,
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the patch indicates a file deletion.
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In this case, the file printed is the file being removed.
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.SH SEE ALSO
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.IR diff (1),
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.IR git/export (1)
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.SH BUGS
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.PP
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The output of
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.B diff -c
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is not handled.
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.PP
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Reject files and backups are not supported.
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.PP
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All files are processed in memory, limiting the maximum file size to available RAM.
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