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Full Discussion: Huge files manipulation
Top Forums UNIX for Advanced & Expert Users Huge files manipulation Post 302255482 by joeyg on Thursday 6th of November 2008 01:32:13 PM
Old 11-06-2008
Hammer & Screwdriver Could you break into lots of files, do your work, then recombine?

I am thinking here...
based on the first position character, copy all lines with "^[aA]" to file_a by using grep (for instance)
repeat for bB and cC and so on

then do your dup check (sort -u maybe) on each of 26 files

finally, recombine the 26 files
 

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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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