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Full Discussion: Command comparisons
Top Forums UNIX for Dummies Questions & Answers Command comparisons Post 302535486 by avidrunner on Thursday 30th of June 2011 11:50:51 PM
Old 07-01-2011
Error Command comparisons

Hi guys,
Im trying to figure out what is the difference between using a | and the command xargs ... examples of usage:

1) ls * | wc -w => this gives you the number of files in the current directory including all subdirectories

2) find . “*.log” | xargs grep ERROR => this gives you all the occurrences of ERROR in all .log files in the current directory and all subdirectories

PLUS! what is the difference of the above commands to this one below and why should I use one instead of the other:

find . “*.log” -exec grep ERROR ‘{}' \;

Any help will be very much appreciated.
 

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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)
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