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Top Forums UNIX for Advanced & Expert Users Best way to search for patterns in huge text files Post 302385614 by andy2000 on Friday 8th of January 2010 04:27:50 PM
Old 01-08-2010
Bug Best way to search for patterns in huge text files

I have the following situation:

a text file with 50000 string patterns:

Code:
abc2344536
gvk6575556
klo6575556
....

and 3 text files each with more than 1 million lines:

Code:
...
000000 abc2344536      46575 0000
000000 abc2344536      46575 4444
000000 abc2344555      46575 1234
...

I have to extract all lines from the 3 files that match all patterns from the pattern file :-)

Any ideas, please!!!

Andy

Last edited by radoulov; 01-08-2010 at 05:32 PM.. Reason: Please use code tags!
 

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fmt(1)							      General Commands Manual							    fmt(1)

NAME
fmt - format text SYNOPSIS
width] [file...] DESCRIPTION
The command is a simple text formatter that fills and joins lines to produce output lines of (up to) the number of characters specified in the width option. The default width is 72. concatenates the arguments. If none are given, formats text from the standard input. Blank lines are preserved in the output, as is the spacing between words. does not fill lines beginning with a period for compatibility with Nor does it fill lines starting with Indentation is preserved in the output and input lines with differing indentation are not joined (unless is used). can also be used as an in-line text filter for the command: reformats the text between the cursor location and the end of the paragraph. Options recognizes the following options: Crown margin mode. Preserve the indentation of the first two lines within a paragraph and align the left margin of each subsequent line with that of the second line. This is useful for tagged paragraphs. Split lines only. Do not join short lines to form longer ones. This prevents sample lines of code, and other such "formatted" text, from being unduly combined. Fill output lines to up to width columns. WARNINGS
The width option is acceptable for BSD compatibility, but it may go away in future releases. SEE ALSO
nroff(1), vi(1). fmt(1)
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