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Full Discussion: Search multiple patterns in multiple files
Top Forums Shell Programming and Scripting Search multiple patterns in multiple files Post 302489550 by Chubler_XL on Thursday 20th of January 2011 05:47:58 PM
Old 01-20-2011
Do you have room to unzip all the files somewhere?

Unzip all files and append to one big file (your havelist), then use awk to check each line of your havelist against file1.txt:

Code:
( find . -name "*processed" -print | xargs gunzip -c ) > /scratch/havelist
awk ' NR == FNR { F[i++]=$0; next}
    { for(i in F)if(index($0, F[i])) delete F[i]; }
    END { for(i in F) print "number "F[i]" not found." } ' file1.txt havelist > outputfile.txt
rm /scratch/havelist

awk may chew a big chunk of memory as it loads the 5,000,000 numbers into it's array, and you won't get any output till it's done, but it will be much quicker that your original attempt.
Some more efficency can be gained if you can say that each processed file line only matches to 1 number from file1.txt (ie a line in processed file dosn't contain 2 or more numbers you are looking for).

But, with record counts this large you should really be considering using a database rather than flat/zipped files.

---------- Post updated at 08:47 AM ---------- Previous update was at 08:15 AM ----------

If you just don't have room to extract to a scratchfile you can do the search through a pipe:

Code:
( find . -name "*processed" -print | xargs gunzip -c ) | awk ' NR == FNR { F[i++]=$0; next}
    { for(i in F)if(index($0, F[i])) delete F[i]; }
    END { for(i in F) print "number "F[i]" not found." } ' file1.txt - > outputfile.txt

Last edited by Chubler_XL; 01-20-2011 at 06:55 PM.. Reason: Orginal solution listed processed lines not in file1.txt
 

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LEARN ABOUT REDHAT

mac2unix

dos2unix(1)						      General Commands Manual						       dos2unix(1)

NAME

       dos2unix - DOS/MAC to UNIX text file format converter

SYNOPSYS

       dos2unix [options] [-c convmode] [-o file ...] [-n infile outfile ...]

       Options:

       [-hkqV] [--help] [--keepdate] [--quiet] [--version]

DESCRIPTION

       This manual page documents dos2unix, the program that converts plain text files in DOS/MAC format to UNIX format.

OPTIONS

       The following options are available:

       -h --help
	      Print online help.

       -k --keepdate
	      Keep the date stamp of output file same as input file.

       -q --quiet
	      Quiet mode. Suppress all warning and messages.

       -V --version
	      Prints version information.

       -c --convmode convmode
	      Sets conversion mode. Simulates dos2unix under SunOS.

       -o --oldfile file ...
	      Old file mode. Convert the file and write output to it. The program default to run in this mode. Wildcard names may be used.

       -n --newfile infile outfile ...
	      New  file  mode.	Convert the infile and write output to outfile. File names must be given in pairs and wildcard names should NOT be
	      used or you WILL lost your files.

EXAMPLES

       Get input from stdin and write output to stdout.

	      dos2unix

       Convert and replace a.txt. Convert and replace b.txt.

	      dos2unix a.txt b.txt

	      dos2unix -o a.txt b.txt

       Convert and replace a.txt in ASCII conversion mode.  Convert and replace b.txt in ISO conversion mode.  Convert	c.txt  from  Mac  to  Unix
       ascii format.

	      dos2unix a.txt -c iso b.txt

	      dos2unix -c ascii a.txt -c iso b.txt

	      dos2unix -c mac a.txt b.txt

       Convert and replace a.txt while keeping original date stamp.

	      dos2unix -k a.txt

	      dos2unix -k -o a.txt

       Convert a.txt and write to e.txt.

	      dos2unix -n a.txt e.txt

       Convert a.txt and write to e.txt, keep date stamp of e.txt same as a.txt.

	      dos2unix -k -n a.txt e.txt

       Convert and replace a.txt. Convert b.txt and write to e.txt.

	      dos2unix a.txt -n b.txt e.txt

	      dos2unix -o a.txt -n b.txt e.txt

       Convert c.txt and write to e.txt. Convert and replace a.txt.  Convert and replace b.txt. Convert d.txt and write to f.txt.

	      dos2unix -n c.txt e.txt -o a.txt b.txt -n d.txt f.txt

DIAGNOSTICS

BUGS

       The program does not work properly under MSDOS in stdio processing mode.  If you know why is that so, please tell me.

AUTHORS

       Benjamin Lin - <blin@socs.uts.edu.au>

       Bernd Johannes Wuebben (mac2unix mode) <wuebben@kde.org>

MISCELLANY

       Tested environment:

	      Linux 1.2.0 with GNU C 2.5.8

	      SunOS 4.1.3 with GNU C 2.6.3

	      MS-DOS 6.20 with Borland C++ 4.02

       Suggestions and bug reports are welcome.

SEE ALSO

       unix2dos(1) mac2unix(1)

1995.03.31							   dos2unix v3.0						       dos2unix(1)
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