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Full Discussion: sed read X lines after match
Top Forums Shell Programming and Scripting sed read X lines after match Post 302758259 by bakunin on Friday 18th of January 2013 04:17:43 PM
Old 01-18-2013
The obvious way is to match a line, then use the "n" command to read more lines and finally output them with the "p" command (adjust the number of "n"s to match your goal):

Code:
sed -n '/<match-regexp>/ { n, n, p }' /path/to/infile

Another possibility would be a "range clause": ranges start with a starting regexp and end either with an ending regexp or a line number, which can be absolute (simply a number) or relative to the file position. This is what ".,$ ..." is: from the current line (".") to the end of the file ("$"). The blueprint is:

Code:
/<start-regexp>/,/<end-regexp>/ {cmd, cmd, ... }

It is possible in "vi" to use relative line numbers like you did:

Code:
/<regexp>/,+10 {cmd}

but i doubt this is standard BRE (would have to consult the reference, which i haven't access to right now). The above solution is guaranteed to work with every "sed", though.

By the way, check the man page of your "grep". Some versions have the feature you look for: they can match a line and then output a configurable mount of lines before and/or after the match.

I hope this helps.

bakunin
 

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LSDIFF(1)							     Man pages								 LSDIFF(1)

NAME
lsdiff - show which files are modified by a patch SYNOPSIS
lsdiff [[-n] | [--line-number]] [[-p n] | [--strip-match=n]] [--strip=n] [--addprefix=PREFIX] [[-s] | [--status]] [[-E] | [--empty-files-as-removed]] [[-i PATTERN] | [--include=PATTERN]] [[-x PATTERN] | [--exclude=PATTERN]] [[-z] | [--decompress]] [[-# RANGE] | [--hunks=RANGE]] [--lines=RANGE] [--files=RANGE] [[-H] | [--with-filename]] [[-h] | [--no-filename]] [[-v] | [--verbose]...] [file...] lsdiff {[--help] | [--version] | [--filter ...] | [--grep ...]} DESCRIPTION
List the files modified by a patch. You can use both unified and context format diffs with this program. OPTIONS
-n, --line-number Display the line number that each patch begins at. If verbose output is requested (using -nv), each hunk of each patch is listed as well. For each file that is modified, a line is generated containing the line number of the beginning of the patch, followed by a Tab character, followed by the name of the file that is modified. If -v is given once, following each of these lines will be one line for each hunk, consisting of a Tab character, the line number that the hunk begins at, another Tab character, the string "Hunk #", and the hunk number (starting at 1). If the -v is given twice in conjunction with -n (i.e. -nvv), the format is slightly different: hunk-level descriptive text is shown after each hunk number, and the --number-files option is enabled. --number-files File numbers are listed, beginning at 1, before each filename. -# RANGE, --hunks=RANGE Only list hunks within the specified RANGE. Hunks are numbered from 1, and the range is a comma-separated list of numbers or "first-last" spans; either the first or the last in the span may be omitted to indicate no limit in that direction. --lines=RANGE Only list hunks that contain lines from the original file that lie within the specified RANGE. Lines are numbered from 1, and the range is a comma-separated list of numbers or "first-last" spans; either the first or the last in the span may be omitted to indicate no limit in that direction. --files=RANGE Only list files indicated by the specified RANGE. Files are numbered from 1 in the order they appear in the patch input, and the range is a comma-separated list of numbers or "first-last" spans; either the first or the last in the span may be omitted to indicate no limit in that direction. -p n, --strip-match=n When matching, ignore the first n components of the pathname. --strip=n Remove the first n components of the pathname before displaying it. --addprefix=PREFIX Prefix the pathname with PREFIX before displaying it. -s, --status Show file additions, modifications and removals. A file addition is indicated by a "+", a removal by a "-", and a modification by a "!". -E, --empty-files-as-removed Treat empty files as absent for the purpose of displaying file additions, modifications and removals. -i PATTERN, --include=PATTERN Include only files matching PATTERN. -x PATTERN, --exclude=PATTERN Exclude files matching PATTERN. -z, --decompress Decompress files with extensions .gz and .bz2. -H, --with-filename Print the name of the patch file containing each patch. -h, --no-filename Suppress the name of the patch file containing each patch. -v, --verbose Verbose output. --help Display a short usage message. --version Display the version number of lsdiff. --filter Behave like filterdiff(1) instead. --grep Behave like grepdiff(1) instead. SEE ALSO
filterdiff(1), grepdiff(1) EXAMPLES
To sort the order of touched files in a patch, you can use: lsdiff patch | sort -u | xargs -rn1 filterdiff patch -i To show only added files in a patch: lsdiff -s patch | grep '^+' | cut -c2- | xargs -rn1 filterdiff patch -i To show the headers of all file hunks: lsdiff -n patch | (while read n file do sed -ne "$n,$(($n+1))p" patch done) AUTHOR
Tim Waugh <twaugh@redhat.com> Package maintainer patchutils 23 Jan 2009 LSDIFF(1)
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