Solved

sed

Posted on 2000-05-11
5
1,004 Views
Last Modified: 2013-12-26
I have a text file that may have an improper character at a specific character position.  If this improper character is found, then it needs to be converted to a space.

Example: IF character 45 = 0 THEN
              character 45 should be " "

Can this be done with sed/awk?
0
Comment
Question by:afpcos
  • 3
  • 2
5 Comments
 
LVL 12

Expert Comment

by:geotiger
ID: 2801858
The following code will do it:

sed -e 's/your_chr/ /g' your_file > newfile
0
 
LVL 2

Author Comment

by:afpcos
ID: 2801884
The problem is that the same character that is in character position 45 could be in several other character positions on the same line.  I only want to replace the one in character position 45.
0
 
LVL 2

Author Comment

by:afpcos
ID: 2801885
The problem is that the same character that is in character position 45 could be in several other character positions on the same line.  I only want to replace the one in character position 45.
0
 
LVL 12

Accepted Solution

by:
geotiger earned 30 total points
ID: 2801924
Did not read your question carefully in the last comment.

You may need to use awk instead of sed. Here is the solution: you can specify the location (pos), from character (fc), and to character (tc).


$ more tst_cc.awk

#!/bin/nawk -f
BEGIN{}
{ len = length($0)
  c1 = substr($0, 1, pos -1)
  c2 = substr($0, pos, 1)
  c3 = substr($0, pos+1, len - pos)
  if (c2==fc) { c2 = tc }
  print c1 c2 c3
}
END {}

$ more tst03.txt
  01/01/1999|01:20|0011|12|678...
  01/01/1999|03:20|0621||4...
  01/01/1999|05:41|0001|1|77...
$ ./tst_cc.awk pos=6 fc=0 tc=x tst03.txt
  01/x1/1999|01:20|0011|12|678...
  01/x1/1999|03:20|0621||4...
  01/x1/1999|05:41|0001|1|77...





0
 
LVL 2

Author Comment

by:afpcos
ID: 2804409
Thanks!!!
0

Featured Post

On Demand Webinar - Networking for the Cloud Era

This webinar discusses:
-Common barriers companies experience when moving to the cloud
-How SD-WAN changes the way we look at networks
-Best practices customers should employ moving forward with cloud migration
-What happens behind the scenes of SteelConnect’s one-click button

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction: Load and Save to file, Document-View interaction inside the SDI. Continuing from the second article about sudoku.   Open the project in visual studio. From the class view select CSudokuDoc and double click to open the header …
Exception Handling is in the core of any application that is able to dignify its name. In this article, I'll guide you through the process of writing a DRY (Don't Repeat Yourself) Exception Handling mechanism, using Aspect Oriented Programming.
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…

685 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question