06-07-2011
grep first occurrence but continue to next entry in patternfile
I have 1300 files (SearchFiles0001.txt, SearchFiles0002.txt, etc.) , each with 650,000 lines, tab-delimited data.
I have a pattern file, with about 1000 lines with a single word. Each single word is found in the 1300 files once.
If I grep -f PatternFile.txt SearchFiles*.txt >OutputFile.txt
the search takes forever, because it searches 650,000 lines x 1300 files for each of the 1000 words.
If I grep -f PatternFile.txt -m 1 SearchFiles*.txt >OutputFile.txt
the search stops after the first line of PatternFile.txt, and I get an OutputFile.txt with 1300 lines: the first entry of PatternFile.txt, but none of the other 999.
How do I make the search faster (by finding the first occurrence of my search parameter, and then moving on to the next search parameter in PatternFile.txt)?
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LEARN ABOUT PHP
phar.interceptfilefuncs
PHAR.INTERCEPTFILEFUNCS(3) 1 PHAR.INTERCEPTFILEFUNCS(3)
Phar::interceptFileFuncs - instructs phar to intercept fopen, file_get_contents, opendir, and all of the stat-related functions
SYNOPSIS
finalpublicstatic void Phar::interceptFileFuncs (void )
DESCRIPTION
instructs phar to intercept fopen(3), readfile(3), file_get_contents(3), opendir(3), and all of the stat-related functions. If any of
these functions is called from within a phar archive with a relative path, the call is modified to access a file within the phar archive.
Absolute paths are assumed to be attempts to load external files from the filesystem.
This function makes it possible to run PHP applications designed to run off of a hard disk as a phar application.
PARAMETERS
No parameters.
RETURN VALUES
EXAMPLES
Example #1
A Phar.interceptFileFuncs(3) example
<?php
Phar::interceptFileFuncs();
include 'phar://' . __FILE__ . '/file.php';
?>
Assuming that this phar is at /path/to/myphar.phar and it contains file.php and file2.txt, if file.php contains this code:
Example #2
A Phar.interceptFileFuncs(3) example
<?php
echo file_get_contents('file2.txt');
?>
Normally PHP would search the current directory for file2.txt, which would translate as the directory of file.php, or the current direc-
tory of a command-line user. Phar.interceptFileFuncs(3) instructs PHP to consider the current directory to be phar:///path/to/myphar.phar/
and so opens phar:///path/to/myphar.phar/file2.txt in the above example code.
PHP Documentation Group PHAR.INTERCEPTFILEFUNCS(3)