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Top Forums Shell Programming and Scripting Find pattern in first field of file Post 302957956 by krsnadasa on Saturday 17th of October 2015 12:24:33 AM
Old 10-17-2015
Find pattern in first field of file

Hello all

I have two files.

1. Pattern.txt - It contains patterns to be matched. It has large number of patterns to be matched.
Code:
Cat Pattern.txt

Ram
Shyam
Mohan
Jhon

I have another file which has actual data and records are delimted by single or multiple spaces.
Code:
2. Content.txt

Cat Content.txt
1@GU00450012@Ram   @@@@ bla1  lba2.
2@GU11950004@David @@@@ uss  Ram 
3@GU11950004@Shyam @@@@ uss   rupa
etc etc

Now I need to find the pattern in content.txt but only in first field. I tried using
Code:
grep -F -f pattern.txt content.txt

It returns me rows like
Code:
2@GU11950004@David @@@@ uss  Ram

Becuase it contains pattern called 'Ram' somewhere
It seems to work but it looks the pattern all over the file. I need to restrict the search to first field only. Hen
I know we I can store patterns using awk in array using
Code:
NR==FNR

but not sure how to search each of them in content.txt in first field only.

Looking for any help.

Thanks

Last edited by krsnadasa; 10-17-2015 at 01:43 AM..
 

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gensprep(8)							 ICU 50.1.2 Manual						       gensprep(8)

NAME
gensprep - compile StringPrep data from files filtered by filterRFC3454.pl SYNOPSIS
gensprep [ -h, -?, --help ] [ -v, --verbose ] [ -c, --copyright ] [ -s, --sourcedir source ] [ -d, --destdir destination ] DESCRIPTION
gensprep reads filtered RFC 3454 files and compiles their information into a binary form. The resulting file, <name>.icu, can then be read directly by ICU, or used by pkgdata(8) for incorporation into a larger archive or library. The files read by gensprep are described in the FILES section. OPTIONS
-h, -?, --help Print help about usage and exit. -v, --verbose Display extra informative messages during execution. -c, --copyright Include a copyright notice into the binary data. -s, --sourcedir source Set the source directory to source. The default source directory is specified by the environment variable ICU_DATA. -d, --destdir destination Set the destination directory to destination. The default destination directory is specified by the environment variable ICU_DATA. ENVIRONMENT
ICU_DATA Specifies the directory containing ICU data. Defaults to /usr/share/icu/50.1.2/. Some tools in ICU depend on the presence of the trailing slash. It is thus important to make sure that it is present if ICU_DATA is set. FILES
The following files are read by gensprep and are looked for in the source /misc for rfc3454_*.txt files and in source /unidata for Normal- izationCorrections.txt. rfc3453_A_1.txt Contains the list of unassigned codepoints in Unicode version 3.2.0.... rfc3454_B_1.txt Contains the list of code points that are commonly mapped to nothing.... rfc3454_B_2.txt Contains the list of mappings for casefolding of code points when Normalization form NFKC is specified.... rfc3454_C_X.txt Contains the list of code points that are prohibited for IDNA. NormalizationCorrections.txt Contains the list of code points whose normalization has changed since Unicode Version 3.2.0. VERSION
50.1.2 COPYRIGHT
Copyright (C) 2000-2002 IBM, Inc. and others. SEE ALSO
pkgdata(8) ICU MANPAGE
18 March 2003 gensprep(8)
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