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Full Discussion: Command comparisons
Top Forums UNIX for Dummies Questions & Answers Command comparisons Post 302535577 by methyl on Friday 1st of July 2011 06:44:15 AM
Old 07-01-2011
Java
There are some funny quote characters here like it has come from a Windows editor. Also the "-name" parameter is missing.
Quote:
find . “*.log” | xargs grep ERROR
find . “*.log” –exec grep ERROR ‘{}’ \;
You probably mean:
Code:
find . -type f -name '*.log' | xargs grep "ERROR"
find . -type f -name '*.log' -exec grep "ERROR" {} \;

On many modern versions of "find" the "+" syntax is actually fastest of all:
Code:
find . -type f -name '*.log' -exec grep "ERROR" \+


Addendum:
Quote:
ls * | wc –w => this gives you the number of files in the current directory including all subdirectories
Sort of true. It does however exclude filenames starting with a period (e.g. .profile). It also sorts each directory to alphabetical order which is a bit of a waste if all you wanted to do was count them. It also gives an incorrect count if any filename contains a space character because you are counting "words". You also count directory files but because "including all subdirectories" is ambiguous it's hard to tell whether this is intentional.

Code:
This is a more efficient and accurate way to count every type of file (including directory files)
find . -print |wc -l
Or if your "find" allows the syntax:
find . | wc -l

Or if you just want to count all files:
find . -type f | wc -l

Last edited by methyl; 07-01-2011 at 08:10 AM..
 

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LEARN ABOUT PHP

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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