Sponsored Content
Top Forums Shell Programming and Scripting Update specific field in a line of text file Post 302755461 by Scrutinizer on Sunday 13th of January 2013 08:30:12 AM
Old 01-13-2013
I tried to reproduce this using variable subj, but I got:

Code:
$ awk -F: '{if($1~subj && $2~lec){$3=newMark}}1' subj="subject1" lec="LecturerA" newMark=100 OFS=":" infile
subject1:LecturerA:100

subject2:LecturerA:40
$ b=subject1 lect=LecturerA mark=100
$ awk -F: '{if($1~subj&&$2~lec){$3=newMark}}1' subj="$sb" lec="$lect" newMark="$mark" OFS=":" infile
subject1:LecturerA:100

subject2:LecturerA:40

What is your OS and version?
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Adding specific text and spaces to each line in a text file

Hi, I wanted to add specific text to each row in a text file containing three rows. Example: 0 8 7 6 5 5 7 8 9 0 7 9 7 8 9 0 1 2 And I want to add a 21 at the beginning of the first row, and blank spaces at the beginning of the second two rows. To get this: 21 0 8 7 6 5 5 7 8... (4 Replies)
Discussion started by: hertingm
4 Replies

2. Shell Programming and Scripting

how to cut a field of a line in a text file?

Hi, I have text file which contains lines like : a/a/a/a/.project b/b/b/b/b/.project c/c/c/.project d/.project e/e/e/e/.project i want for all lines the last word .project should be removed and the file should look like : a/a/a/a/ b/b/b/b/b/ c/c/c/ .... how to proceed... (7 Replies)
Discussion started by: bhaskar_m
7 Replies

3. Shell Programming and Scripting

Update a specific line in a file while reading sequentially

All, I know this is a very naive question but I could not find a way to get this working! I have a file with values like input.file Value1 Value2 server1/mylogin,mypasswd Value3 Value4 And in my code, I am reading the file line by line and processing it. #! /bin/ksh... (6 Replies)
Discussion started by: bharath.gct
6 Replies

4. Shell Programming and Scripting

replacing field in specific line in a file

Hi, I know there are lots of threads on replacing text within files, usually using sed or awk. However, I find it hard to adapt examples that I found to my specific case. I am kind of new to UNIX and have hard times learning the syntax either for sed or awk so I would appreciate any help. Here's... (5 Replies)
Discussion started by: vytenis
5 Replies

5. Shell Programming and Scripting

Using awk to read a specific line and a specific field on that line.

Say the input was as follows: Brat 20 x 1000 32rf Pour 15 p 1621 05pr Dart 10 z 1111 22xx My program prompts for an input, what I want is to use the input to locate a specific field. Like if I type in, "Pou" then it would return "Pour" and just "Pour" I currently have this line but it is... (6 Replies)
Discussion started by: Bungkai
6 Replies

6. Shell Programming and Scripting

Replace specific field on specific line sed or awk

I'm trying to update a text file via sed/awk, after a lot of searching I still can't find a code snippet that I can get to work. Brief overview: I have user input a line to a variable, I then find a specific value in this line 10th field in this case. After asking for new input and doing some... (14 Replies)
Discussion started by: crownedzero
14 Replies

7. Shell Programming and Scripting

Extract specific line in an html file starting and ending with specific pattern to a text file

Hi This is my first post and I'm just a beginner. So please be nice to me. I have a couple of html files where a pattern beginning with "http://www.site.com" and ending with "/resource.dat" is present on every 241st line. How do I extract this to a new text file? I have tried sed -n 241,241p... (13 Replies)
Discussion started by: dejavo
13 Replies

8. Shell Programming and Scripting

Perl to update field based on a specific set of rules

In the perl below, which does execute, I am having trouble with the else in Rule 3. The digit in f{8} is extracted and used to update f accordinly along with the value in f. There can be either - * or + before the number that is extracted but the same logic applies, that is if the value is greater... (5 Replies)
Discussion started by: cmccabe
5 Replies

9. Shell Programming and Scripting

Update a specific field in file with Variable value based on other Key Word

I have an input file with A=xyz B=pqr I would want the value in Second Field (xyz or pqr) updated with a value present in Shell Variable based on the value passed in the first field. (A or B ) while read line do NEW_VALUE = `some functionality done on $line` If $line=First Field-... (1 Reply)
Discussion started by: infernalhell
1 Replies

10. UNIX for Beginners Questions & Answers

awk to update file with partial matching line in another file and append text

In the awk below I am trying to cp and paste each matching line in f2 to $3 in f1 if $2 of f1 is in the line in f2 somewhere. There will always be a match (usually more then 1) and my actual data is much larger (several hundreds of lines) in both f1 and f2. When the line in f2 is pasted to $3 in... (4 Replies)
Discussion started by: cmccabe
4 Replies
symlink(3)						User Contributed Perl Documentation						symlink(3)

NAME
PerlIO::via::symlink - PerlIO layers for create symlinks SYNOPSIS
open $fh, '>:via(symlink)', $fname; print $fh "link foobar"; close $fh; DESCRIPTION
The PerlIO layer "symlink" allows you to create a symbolic link by writing to the file handle. You need to write C"link $name" to the file handle. If the format does not match, "close" will fail with EINVAL. TEST COVERAGE
----------------------------------- ------ ------ ------ ------ ------ ------ File stmt branch cond sub time total ----------------------------------- ------ ------ ------ ------ ------ ------ blib/lib/PerlIO/via/symlink.pm 100.0 100.0 n/a 100.0 100.0 100.0 Total 100.0 100.0 n/a 100.0 100.0 100.0 ----------------------------------- ------ ------ ------ ------ ------ ------ AUTHORS
Chia-liang Kao <clkao@clkao.org> COPYRIGHT
Copyright 2004-2005 by Chia-liang Kao <clkao@clkao.org>. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See <http://www.perl.com/perl/misc/Artistic.html> perl v5.18.2 2005-03-01 symlink(3)
All times are GMT -4. The time now is 03:44 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy