Replace specific positions in a file

Login or Register for Dates, Times and to Reply

Thread Tools Search this Thread
Top Forums UNIX for Beginners Questions & Answers Replace specific positions in a file
# 1  
Replace specific positions in a file

I have a fixed-length positional file. I am trying to replace content of position 4-13 (length=10) with xxxxxxxxxx.
Sample 2 rows in this file:

H0187459823  172SMITH, JOE
H0112345678  172DOE, JANE

In this example 87459823 (from 1st line) and 12345678 (from 2nd line) (both in position 4-13) would be replaced with xxxxxxxxxx

Any help is much appreciated.

Last edited by vgersh99; 03-01-2019 at 03:02 PM.. Reason: Code tags, please!
This User Gave Thanks to Diver181 For This Post:
# 2  
Here is a way to play with awk

akshay@db-3325:/tmp$ cat file
H0187459823 172SMITH, JOE
H0112345678 172DOE, JANE

akshay@db-3325:/tmp$ awk '{print substr($0,1,3)"<put_your_string>"substr($0,13)}' file
H01<put_your_string>172SMITH, JOE
H01<put_your_string>172DOE, JANE

These 2 Users Gave Thanks to Akshay Hegde For This Post:
# 3  
Welcome to the forum.

Please always show your OS, shell, and preferred tools' versions, so the solutions proposed will match your setup.
And, add code tags around code and data as required by forum rules.

Any preferred tools?

Mayhap my arithmetics are wrong, but 12345678 and 87459823 cannot fill character positions 4-13?
# 4  
thank you. it worked.

--- Post updated at 07:23 PM ---

Sure. Thank you. Will do.
By the way In my example above both numbers have trailing spaces of 2 characters which makes each of length 10.
Starting position, for both lines, is 4 and ending position is 13 (includes 2 spaces at the end).
This User Gave Thanks to Diver181 For This Post:
Login or Register for Dates, Times and to Reply

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #546
Difficulty: Medium
In computer science, an operator takes the values of its operands and combines them in some way to produce a new value.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Search and replace specific positions of specific lines

Hi, I have a file with hundreds of lines. I want to search for particular lines starting with 4000, search and replace the 137-139 position characters; which will be '000', with '036'. Can all of this be done without opening a temp file and then moving that temp file to the original file name. ... (7 Replies)
Discussion started by: dsid
7 Replies

2. Shell Programming and Scripting

Filter lines based on values at specific positions

hi. I have a Fixed Length text file as input where the character positions 4-5(two character positions starting from 4th position) indicates the LOB indicator. The file structure is something like below: 10126Apple DrinkOmaha 10231Milkshake New Jersey 103 Billabong Illinois ... (6 Replies)
Discussion started by: kumarjt
6 Replies

3. UNIX for Dummies Questions & Answers

Replace alphabets from certain positions

Hi all, I have column 2 full of values like HIVE4A-56 and HIVE4-56. I want to convert all values like HIVE4A-56 to HIVE4-56. So basically I want to delete all single alphabets before the '-' which is always preceded by a number. Values already in the desired format should remain unchanged... (4 Replies)
Discussion started by: ames1983
4 Replies

4. Shell Programming and Scripting

sed to replace specific positions on line with file contents

Hi, I am trying to use an awk command to replace specific character positions on a line beginning with 80 with contents of another file. The line beginning with 80 in file1 is as follows: I want to replace the 000000000178800 (positions 34 - 49) on this file with the contents of... (2 Replies)
Discussion started by: nwalsh88
2 Replies

5. Shell Programming and Scripting

Count specific characters at specific column positions

Hi all, I need help. I have an input text file (input.txt) like this: 21 GTGCAACACCGTCTTGAGAGG 50 21 GACCGAGACAGAATGAAAATC 73 21 CGGGTCTGTAGTAGCAAACGC 108 21 CGAAAAATGAACCCCTTTATC 220 21 CGTGATCCTGTTGAAGGGTCG 259 Now I need to count A/T/G/C numbers at each character location in column... (2 Replies)
Discussion started by: thienxho
2 Replies

6. Shell Programming and Scripting

output strings to specific positions in a file

Been searching for about 3 hours for similar functionality that I can get examples of how to output text from variables into certain locations in a file. I would like to incorporate this into a script. I have not been able to find a command example that does it all in one method. I find part of... (1 Reply)
Discussion started by: bennu_500
1 Replies

7. Shell Programming and Scripting

Replace a string within a file.. with help of positions

I have a huge file with lot of rows... with each row around 400 characters.. with spaces as well.. (e.g) Line1: "AC254600606 USDMI000001Anom01130073981 0000000000000.002005040720991231 ... (13 Replies)
Discussion started by: gopeezere
13 Replies

8. Shell Programming and Scripting

awk script replace positions if certain positions equal prescribed value

I am attempting to replace positions 44-46 with YYY if positions 48-50 = XXX. awk -F "" '{if (substr($0,48,3)=="XXX") $44="YYY"}1' OFS="" $filename > $tempfile But this is not working, 44-46 is still spaces in my tempfile instead of YYY. Any suggestions would be greatly appreciated. (9 Replies)
Discussion started by: halplessProblem
9 Replies

9. Shell Programming and Scripting

Need specific byte positions of a file

Hello , I need to extract data from specific byte positions of a file. I have tried the below command awk ' { printf "%s", substr($0, 642363,642369}' filename to extract data between byte positions 642363 and 642369 . However I did not get the expected result. I am new to awk... (6 Replies)
Discussion started by: rmv
6 Replies

10. Shell Programming and Scripting

Replace 9-16 positions of a text file.

Hi i am having text file like this 40000201040005200213072009000000700000050744820906904421 40069300240005200713072009000000067400098543630000920442 i want to replace 9-16 positions of my txt a single line command i.e 0400052....should be replaced by... (2 Replies)
Discussion started by: suryanarayana
2 Replies

Featured Tech Videos