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Top Forums Shell Programming and Scripting How to get a very big file sorted by contents of another variable list in one pass? Post 302459054 by Bashingaway on Sunday 3rd of October 2010 01:25:34 PM
Old 10-03-2010
How to get a very big file sorted by contents of another variable list in one pass?

I have two list....

One has 17m (yes that's million) records in it which relate to the path and file name of individual text files.

At the start of the pathname is a two character identifier identifying which category it belongs in as identified by a second file with the two character lookup table.

So for example

Code:
Big File

/BB/26607/B7763/BTHS/name1.txt
/DF/78873/YHH97/H764/name76.txt
/BB/8766/OP764/Y7644/name39.txt

In the second file (usually about 42 different two letter identifiers).

Code:
BB
JH
DF
ND

What I want to do is not just sort the master file but split and prioritise it by the order in the second list and try to do it in one pass as processing 17m records is taking about 7 minutes per pass on the system I'm using.

I can't think of a simple way to do this and am suffering from too much typing today now, so could anyone give me some good ideas please?

Thanks
 

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GZEXE(1)						      General Commands Manual							  GZEXE(1)

NAME
gzexe - compress executable files in place SYNOPSIS
gzexe [ name ... ] DESCRIPTION
The gzexe utility allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a penalty in performance). For example if you execute ``gzexe /bin/cat'' it will create the following two files: -r-xr-xr-x 1 root bin 9644 Feb 11 11:16 /bin/cat -r-xr-xr-x 1 bin bin 24576 Nov 23 13:21 /bin/cat~ /bin/cat~ is the original file and /bin/cat is the self-uncompressing executable file. You can remove /bin/cat~ once you are sure that /bin/cat works properly. This utility is most useful on systems with very small disks. OPTIONS
-d Decompress the given executables instead of compressing them. SEE ALSO
gzip(1), znew(1), zmore(1), zcmp(1), zforce(1) CAVEATS
The compressed executable is a shell script. This may create some security holes. In particular, the compressed executable relies on the PATH environment variable to find gzip and some other utilities (tail, chmod, ln, sleep). BUGS
gzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually in some cases, using chmod or chown. GZEXE(1)
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