Sponsored Content
Top Forums Shell Programming and Scripting use awk to edit a file..pls help Post 302438067 by Scott on Sunday 18th of July 2010 06:53:27 AM
Old 07-18-2010
Hi.

awk writes to standard output (the screen), not back to the file.

With awk, you can do this:

Code:
awk -F ":" -v OFS=: ' /no./ $4="new value" ' file > new_file && cp new_file file && rm new_file

 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Pls Help - Need to edit file located in several directories

I need to update an entry called "mail.RiskNavigatorFromEmailAddress" in all of the "Application.properties" files below, which are located in several different directories... Each of these Application.properties files has the following entry: ... (3 Replies)
Discussion started by: kthatch
3 Replies

2. Shell Programming and Scripting

Help needed in 'awk' : pls.

we have a file File1.I have used the below code to append 'file1' to each row.it is appending 'file1' but there is 5 empty space is coming after the end of each row.i found this opening in 'vi' mode and moving the cursor on each row ...can u help me ... File1: E100|0|05/29/1993|0|E001|E000... (3 Replies)
Discussion started by: satyam_sat
3 Replies

3. UNIX for Dummies Questions & Answers

Pls help me with file editing using awk

Hi all, Pls help me with file editing using awk. I have a text file with the below format. "STANDARD VOLUME ","2009","BUX","V","JCBH49","NF", 001413 "VENDOR MATERIAL-STD ","2009","BUX","V","JCBH49","NF", 009948 "INBOUND TRANS-STD ... (2 Replies)
Discussion started by: srinivas.maddy
2 Replies

4. Shell Programming and Scripting

edit entire column from a fixed-width file using awk or sed

Col1 Col2 Col3 Col4 12 Completed 08 0830 12 In Progress 09 0829 11 For F U 07 0828 Considering the file above, how could i replace the third column the most efficient way? The actual file size is almost 1G. I am... (10 Replies)
Discussion started by: tamahomekarasu
10 Replies

5. Shell Programming and Scripting

File edit with awk or sed

I have the follwoing file: This looks to be : seperated. For the first field i want only the file name without ".txt" and also i want to remove "+" sign if the second field starts with "+" sign. Input file: Output file: Appreciate your help (9 Replies)
Discussion started by: pinnacle
9 Replies

6. Shell Programming and Scripting

Sed or Awk or both to edit file

What is an efficient way to remove all lines from the input file which contain a file name? inputfile: ======================= # comment # comment # comment 5 8 10 /tmp 5 8 10 /var/run 5 8 10 /etc/vfstab 5 8 9 /var/tmp 5 8 10 /var/adm/messages... (7 Replies)
Discussion started by: Arsenalman
7 Replies

7. Shell Programming and Scripting

scripting/awk help : awk sum output is not comming in regular format. Pls advise.

Hi Experts, I am adding a column of numbers with awk , however not getting correct output: # awk '{sum+=$1} END {print sum}' datafile 2.15291e+06 How can I getthe output like : 2152910 Thank you.. # awk '{sum+=$1} END {print sum}' datafile 2.15079e+06 (3 Replies)
Discussion started by: rveri
3 Replies

8. Shell Programming and Scripting

search and edit in the same file using awk

Hi, I am having a user.txt contains the name of users and passwd.txt file contains as passwd.txt $cat usr.txt root bin daemon cap $cat passwd.txt root:x:0:0:root:/root:/usr/bin/ksh bin:x:1:1:bin:/bin:/sbin/csh daemon:x:2:2:daemon:/sbin:/usr/bin/ksh adm:x:3:4:adm:/var/adm:/sbin/nologin... (4 Replies)
Discussion started by: Manabhanjan
4 Replies

9. Shell Programming and Scripting

How to get awk to edit in place and join all lines in text file

Hi, I lack the utter fundamentals on how to craft an awk script. I have hundreds of text files that were mangled by .doc format so all the lines are broken up so I need to join all of the lines of text into a single line. Normally I use vim command "ggVGJ" to join all lines but with so many... (3 Replies)
Discussion started by: n00ti
3 Replies

10. Shell Programming and Scripting

Edit a file using awk ?

Hey guys, I'm trying to learn a bit of awk/sed and I'm using different sites to learn it from, and i think I'm starting to get confused (doesn't take much!). Anyway, say I have a csv file which has something along the lines of the following in it:"test","127.0.0.1","startup... (6 Replies)
Discussion started by: jimbob01
6 Replies
English(3pm)						 Perl Programmers Reference Guide					      English(3pm)

NAME
English - use nice English (or awk) names for ugly punctuation variables SYNOPSIS
use English; use English qw( -no_match_vars ) ; # Avoids regex performance penalty # in perl 5.16 and earlier ... if ($ERRNO =~ /denied/) { ... } DESCRIPTION
This module provides aliases for the built-in variables whose names no one seems to like to read. Variables with side-effects which get triggered just by accessing them (like $0) will still be affected. For those variables that have an awk version, both long and short English alternatives are provided. For example, the $/ variable can be referred to either $RS or $INPUT_RECORD_SEPARATOR if you are using the English module. See perlvar for a complete list of these. PERFORMANCE
NOTE: This was fixed in perl 5.20. Mentioning these three variables no longer makes a speed difference. This section still applies if your code is to run on perl 5.18 or earlier. This module can provoke sizeable inefficiencies for regular expressions, due to unfortunate implementation details. If performance matters in your application and you don't need $PREMATCH, $MATCH, or $POSTMATCH, try doing use English qw( -no_match_vars ) ; . It is especially important to do this in modules to avoid penalizing all applications which use them. perl v5.18.2 2014-01-06 English(3pm)
All times are GMT -4. The time now is 10:27 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy