Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Replacing a string in nth line

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Replacing a string in nth line
# 1  
Old 06-04-2008
Replacing a string in nth line
Hello All,

How to replace a string in nth line of a file using sed or awk.

For Ex: test.txt

Line 1 : TEST1 TEST2 TEST3
Line 2 : TEST1 TEST2 TEST3 TEST4
Line 3 : TEST1 TEST2 TEST3 TEST5
Line 4 : TEST1 TEST2 TEST3 TEST6
Line 5 : TEST1 TEST2 TEST3 TEST7

i want to go to 4th line of a file and replace the word TEST2 in that line with the word DEV2.

Note : this is not a homework. just need some ideas in SED or AWK

Thanks

Rahul
# 2  
Old 06-04-2008
This site has great sed one-liners.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Delete after nth occurence of string in each line

Hello, Environment: I am under Ubuntu 18.04 bionic. I have an sql file consisting of 10K lines. Objective: What I am trying to attain is to remove everything coming after 2nd tab in each line. While searching for the answer, I found two answers and both gave expected result just for the first... (2 Replies)
Discussion started by: baris35
2 Replies

2. Shell Programming and Scripting

Printing string from last field of the nth line of file to start (or end) of each line (awk I think)

My file (the output of an experiment) starts off looking like this, _____________________________________________________________ Subjects incorporated to date: 001 Data file started on machine PKSHS260-05CP ********************************************************************** Subject 1,... (9 Replies)
Discussion started by: samonl
9 Replies

3. Shell Programming and Scripting

Bash Command to Get Nth Line in a String?

hi i need to get the 3rd line in a string. actually, not sure if it's a string, list, array, or something else. I'm using grep to retrieve all the numbers in a string-- in the console, it displays as multiple lines: $ echo "Sink 0: reference = 0: 153% 1: 45%, real = 0: 62%" | grep -o * 0... (4 Replies)
Discussion started by: johnywhy
4 Replies

4. Shell Programming and Scripting

Replacing nth field with nth_text for each line in a file

Hi All, I am very new to shell scripting and tried to search this in the forum but no luck. Requirment: I have an input file which is comma separated. I need to replace the value in 4th column with another value. This has to happen for all the lines in the file. Sample data: Input... (2 Replies)
Discussion started by: arunkumarsd
2 Replies

5. Shell Programming and Scripting

Calculating average for every Nth line in the Nth column

Is there an awk script that can easily perform the following operation? I have a data file that is in the format of 1944-12,5.6 1945-01,9.8 1945-02,6.7 1945-03,9.3 1945-04,5.9 1945-05,0.7 1945-06,0.0 1945-07,0.0 1945-08,0.0 1945-09,0.0 1945-10,0.2 1945-11,10.5 1945-12,22.3... (3 Replies)
Discussion started by: ncwxpanther
3 Replies

6. Shell Programming and Scripting

find string nth occurrence in file and print line number

Hi I have requirement to find nth occurrence in a file and capture data from with in lines (between lines) Data in File. <QUOTE> <SESSION> <ATTRIBUTE NAME='Parameter Filename' VALUE='file1.parm'/> <ATTRIBUTE NAME='Service Name' VALUE='None'/> </SESSION> <SESSION> <ATTRIBUTE... (6 Replies)
Discussion started by: tmalik79
6 Replies

7. Shell Programming and Scripting

Replacing a string with new line

Hi, Can anyone help me know how to replace a string with the new line for ex: file1 val1 or val2 or val3 or I need to replace the "or" with new line. Thanks in advance (2 Replies)
Discussion started by: mr_manii
2 Replies

8. UNIX for Dummies Questions & Answers

replacing string in a column on a specific line

hi, i currently have a file with columns similar to this customer name owed CID123 John 300 CID342 harry 500 at present i use use awk to find the amount owed by the customer using the customer ID (CID). if the customer spends more money how would i go about using sed/awk etc to... (2 Replies)
Discussion started by: skinnygav
2 Replies

9. UNIX for Advanced & Expert Users

Command to display nth line before the string is matched.

All, Is there any way out to display the nth line before the string is matched ??? Eg : If i have a file which has the following contents and if i want to get the 3rd line before the string is matched a b c d e f if i give the input as f and lines before the match as 3 then it should... (5 Replies)
Discussion started by: helper
5 Replies

10. UNIX for Dummies Questions & Answers

Finding nth occurrence in line and replacing it

Hi, I have several files with data that have to be imported to a database. These files contain records with separator characters. Some records are corrupt (2 separators are missing) and I need to correct them prior to importing them into the db. Example: ... (5 Replies)
Discussion started by: stresing
5 Replies
Login or Register to Ask a Question