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how to grep for blank records (space,tab,/n)?

I want to exclude (-v) blank records from a file before analysing it. I know I can use '^]$' for spaces and tabs but how do you look for lines that have nothing (/n or line feed) ?

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MEM=`ps v $PPID| grep -i db2 | grep -v grep| awk '{ if ( $7 ~ " " ) { print 0 } else

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lsdiff

LSDIFF(1)																 LSDIFF(1)

NAME

       lsdiff - show which files are modified by a patch

SYNOPSIS

       lsdiff [-n] [-p n] [--strip=n] [--addprefix=PREFIX] [-s]
	      [-i PATTERN] [-x PATTERN] [-v] [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     Display the line number that each patch begins at. If verbose output is requested, 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, 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).

       -p 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     Show file additions, modifications and removals. A file addition is indicated by a ``+'', a removal by a ``-'', and  a  modification
	      by a ``!''.

       -i PATTERN
	      Include only files matching PATTERN.

       -x PATTERN
	      Exclude files matching PATTERN.

       -v     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>.

patchutils							    13 May 2002 							 LSDIFF(1)

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

how to grep for blank records (space,tab,/n)?

Discussion started by: Browser_ice

2. UNIX for Dummies Questions & Answers

using Grep with a tab

Discussion started by: Adriel

3. UNIX for Dummies Questions & Answers

why the <tab> could be not recognized in grep and sed?

Discussion started by: alex_5161

4. Shell Programming and Scripting

MEM=`ps v $PPID| grep -i db2 | grep -v grep| awk '{ if ( $7 ~ " " ) { print 0 } else

Discussion started by: hariza