Sponsored Content
Top Forums Shell Programming and Scripting Displaying the first field if the second field matches the pattern using Perl Post 302727119 by royalibrahim on Monday 5th of November 2012 09:11:18 PM
Old 11-05-2012
Quote:
Originally Posted by elixir_sinari
The code you've provided does what it's supposed to do.

First of all, you are opening the file myfile, reading it completely and then closing the associated filehandle, once for each line in the file dummy_file.

For every line from dummy_file in which the 2nd field $F[1] (split on white-space using the -a run-time switch) matches the pattern patt anchored at the end, the first element of the list slice (split(" ", $i))[0], obtained by splitting the line from myfile on white-space, is displayed.

What exactly are you trying to do? Please elaborate with input and output samples.
Thank you, but the dummy file is just an empty file to fulfill or complete the syntax (else Perl reads from stdin). The actual file in action is "myfile" where I am looping over its contents by reading from the file handle 'F'. The white space splitting is done on the myfile's contents and not of the dummy file.

Lets say, my input is, myfile's contents:

aa bb cc
1a 2a 3a

I would like to get the output as:
aa

where 'bb' is the pattern to be matched.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Print line if first Field matches a pattern

Hi All, I would like my code to be able to print out the whole line if 1st field has a dot in the number. Sample input and expected output given below. My AWK code is below but it can;t work, can any expert help me ? Thanks in advance. {if ($1 ~ /*\.*/) { print $0 }} Input: ... (2 Replies)
Discussion started by: Raynon
2 Replies

2. Shell Programming and Scripting

Displaying lines of a file where the second field matches a pattern

Howdy. I know this is most likely possible using sed or awk or grep, most likely a combination of them together, but how would one go about running a grep like command on a file where you only try to match your pattern to the second field in a line, space delimited? Example: You are... (3 Replies)
Discussion started by: LordJezoX
3 Replies

3. Shell Programming and Scripting

adding field values if field matches

hi i have file as below , i want to add duplicate records like bell_bb to one record with valuve as 15 ( addition of both ) any oneline awk script to achive this ? header 0 CAMPAIGN_NAME 1 Bell_BB 14 Bell_MONTHLY 803 SOLO_UNBEATABLE 644 Bell_BB 1 Bell_MONTHLY 25 SOLO_UNBEATABLE... (4 Replies)
Discussion started by: raghavendra.cse
4 Replies

4. Shell Programming and Scripting

How to print line if field matches?

Hi all, I got several lines line this a b c d e 1 e a 1 c d e 3 f a b c 1 e 8 h a b c d e 1 w a 1 c d e 2 w a b c d e 1 t a b c d e 7 4 How can I print the line if 1 is the field one before the last field? Basicly this 2 field ? a b c d e 1 e a b c d e 1 t The file I got is... (7 Replies)
Discussion started by: stinkefisch
7 Replies

5. Shell Programming and Scripting

awk to sum specific field when pattern matches

Trying to sum field #6 when field #2 matches string as follows: Input data: 2010-09-18-20.24.44.206117 UOWEXEC db2bp DB2XYZ hostname 1 2010-09-18-20.24.44.206117 UOWWAIT db2bp DB2XYZ hostname ... (3 Replies)
Discussion started by: ux4me
3 Replies

6. Shell Programming and Scripting

AWK: Pattern match between 2 files, then compare a field in file1 as > or < field in file2

First, thanks for the help in previous posts... couldn't have gotten where I am now without it! So here is what I have, I use AWK to match $1 and $2 as 1 string in file1 to $1 and $2 as 1 string in file2. Now I'm wondering if I can extend this AWK command to incorporate the following: If $1... (4 Replies)
Discussion started by: right_coaster
4 Replies

7. Shell Programming and Scripting

Displaying a field completely

Version: AIX 6.1 (korn shell) In the below output, the field with the heading 'Address' has some names like hwproc214-priv1.gnas.wrd.netwhich are only partially displayed. $ netstat -i Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll en2 1500 link#2 ... (3 Replies)
Discussion started by: polavan
3 Replies

8. UNIX for Dummies Questions & Answers

Match pattern in a field, print pattern only instead of the entire field

Hi ! I have a tab-delimited file, file.tab: Column1 Column2 Column3 aaaaaaaaaa bbtomatoesbbbbbb cccccccccc ddddddddd eeeeappleseeeeeeeee ffffffffffffff ggggggggg hhhhhhtomatoeshhh iiiiiiiiiiiiiiii ... (18 Replies)
Discussion started by: lucasvs
18 Replies

9. UNIX for Dummies Questions & Answers

Displaying field of NR, not the line #

Within AWK, how do you display a field of NR? Here's my code: awk '(NR>1) && (P1=$1-w)>=100000 {print "increase of" " " P1*.0000179," " "kW at" " " 'NR*60/431900' " " "minutes" "\n" "change from" " " 'NR-10($1)' " " "kW to" " " 'NR+70($1)' "\n"}{w=$1}' filename I can change NR and print... (3 Replies)
Discussion started by: markymarkg123
3 Replies

10. Shell Programming and Scripting

Need to replace last field in a file,if first field matches

Hi, Need to replace last field in a file(/etc/passwd) ,if first filed matches with particular username. Scenario: cat testfor1 deekshi:x:7082:7082::/home/deekshi:/bin/bash harini1:x:7083:7083::/home/harini1:/bin/bash Here,if first field contains "deekshi", then i should replace... (4 Replies)
Discussion started by: Sumanthsv
4 Replies
Regexp::Common::URI::prospero(3pm)			User Contributed Perl Documentation			Regexp::Common::URI::prospero(3pm)

NAME
Regexp::Common::URI::prospero -- Returns a pattern for prospero URIs. SYNOPSIS
use Regexp::Common qw /URI/; while (<>) { /$RE{URI}{prospero}/ and print "Contains a prospero URI. "; } DESCRIPTION
$RE{URI}{prospero} Returns a pattern that matches prospero URIs, as defined by RFC 1738. prospero URIs have the form: "prospero:" "//" host [ ":" port ] "/" path [ fieldspec ] * Under "{-keep}", the following are returned: $1 The complete URI. $2 The scheme. $3 The hostname. $4 The port, if given. $5 The propero path. $6 The field specifications, if given. There can be more field specifications; they will all be returned in $6. REFERENCES
[RFC 1738] Berners-Lee, Tim, Masinter, L., McCahill, M.: Uniform Resource Locators (URL). December 1994. SEE ALSO
Regexp::Common::URI for other supported URIs. AUTHOR
Abigail. (regexp-common@abigail.be). BUGS AND IRRITATIONS
Bound to be plenty. LICENSE and COPYRIGHT This software is Copyright (c) 2001 - 2009, Damian Conway and Abigail. This module is free software, and maybe used under any of the following licenses: 1) The Perl Artistic License. See the file COPYRIGHT.AL. 2) The Perl Artistic License 2.0. See the file COPYRIGHT.AL2. 3) The BSD Licence. See the file COPYRIGHT.BSD. 4) The MIT Licence. See the file COPYRIGHT.MIT. perl v5.14.2 2010-02-23 Regexp::Common::URI::prospero(3pm)
All times are GMT -4. The time now is 01:16 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy