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Full Discussion: Awk Vs Fgrep
Top Forums Shell Programming and Scripting Awk Vs Fgrep Post 302382434 by morbid_angel on Wednesday 23rd of December 2009 08:07:03 AM
Old 12-23-2009
Bug Awk Vs Fgrep

Hi All,
I have 2 files new.txt and old.txt

Code:
 
cat new.txt
    sku1|v1|v2|v3
    sku2|v11|v22|v33
    sku3|v11|v22|v33
 
cat old.txt
    sku1|vx1|vx2|vx3
    sku2|vx11|vx22|vx33
    sku3|v11|v22|v33

The key column in both files are first column itself.
I want to get records in new.txt which are not there in old.txt

expected output
Code:
sku1|v1|v2|v3
sku2|v11|v22|v33

The fgrep command fgrep -v -f old.txt new.txt gives me the right answer.
But in my file ,noSmilief columns are 20 and length of each colums is very huge. So fgrep is very slow.. Can we replace fgrep with awk So that this will complete faster .Thnxx in advance

Last edited by zaxxon; 12-23-2009 at 09:17 AM.. Reason: use code tags please, thank you
 

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BZEXE(1)						      General Commands Manual							  BZEXE(1)

NAME
bzexe - compress executable files in place SYNOPSIS
bzexe [ name ... ] DESCRIPTION
The bzexe 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 ``bzexe /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
bzip2(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
bzexe 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. BZEXE(1)
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