Linked Questions

319
votes
2answers
1.6m views

Using 'sed' to find and replace [duplicate]

I know this question has probably been answered before. I have seen many threads about this in various places, but the answers are usually hard to extract for me. I am looking for help with an ...
3
votes
2answers
367 views

How do I delete a line only if it is at the specified line number and it matches the pattern? [duplicate]

How do I delete a line only if it is at a specified line number and it matches the pattern? For example: I want to delete (d); the third line (3); if it's blank (^$); The following syntax: cat ...
-1
votes
1answer
5k views

how to replace a specific pattern from all files [duplicate]

suppose I want to replace abc with xyz in all files in a directory. How do I write a script for this ?
-3
votes
1answer
3k views

How can i replace a specific string within a line inside a text file [duplicate]

$ cat text.txt my name is Steven my age is 10 i like dogs What command will be fitting so that echo "Kate" will replace Steven on text.txt?
0
votes
1answer
3k views

How to replace the last octet of a valid network address with the number 2 [duplicate]

Lets say I have a string that can be any possible/valid network address like so: STR="192.168.1.0/24" What I want to do is replace the last octet (in this case it's 0/24, however it can be anyting) ...
-4
votes
1answer
3k views

How to change certain word in certain line in a file [duplicate]

i have a file in which i have to change a word and then save it by same name. for ex- for file "name"- my name is joe (original data) my name is roy (changed data) how to do it in best possible ...
-1
votes
1answer
1k views

How to edit a file from a script using a loop instead of find and replace with sed? [duplicate]

Here is an example of what I am trying to do: #!/bin/bash Update=$1 if [$Update == Value] then NewValue= $Update vi %s/Value/$NewValue/g > Updatedfile fi exit 0 Is there a way to ...
0
votes
1answer
2k views

How to change a single line in multiple files [duplicate]

I have ~750 .php files in the same directory that contain the line include("path/to/file.php"); I would like to change this line in every file to require_once("path/to/file.php"); What would be an ...
1
vote
1answer
895 views

Grep global find replace [duplicate]

Is there a way to grep for a regular expression on an Ubuntu server and then find and replace it with another string? I am using the following command right now, but it doesn't account for actually ...
0
votes
1answer
647 views

Why won't my change to the sshd_config file persist? [duplicate]

I am writing a script to modify settings on my Ubuntu server. I have the following line in it: sudo sed 's/PasswordAuthentication yes/PasswordAuthentication no/' /etc/ssh/sshd_config The problem is ...
0
votes
1answer
805 views

Modify part of line if keyword is found using sed? [duplicate]

I want to modify a line if a specific keyword is found in a line. CS_CODE, SM_NUM, PORT_NUM, DEV_PORT_NUM, DIRNUM, MAIN_DIRNUM, BILL_NO, ADR_NAME In above line, if 'PORT_NUM' is present then '...
-1
votes
1answer
753 views

How do i create a sed script to prompt the user to replace a number in a file? [duplicate]

I'm new in Unix, and I'm learning about sed command. I need to write a very small script for searching a number in a file and replacing it. I tried doing grep, and than deleting the specific phone ...
0
votes
3answers
102 views

How to modify file content? [duplicate]

Ubuntu 16.04 I have some pretty large file so modifying it by hand is not possible. I'd like to change all occurences of <tag1>true</tag1> to <tag1>false</tag1>
0
votes
2answers
248 views

Insert character at the beginning of specific lines [duplicate]

Let's say I have file: % This is first line % This is second line This is content % This is the end How can I insert a % character at the beginning of every line which already starts with %? ...
2
votes
1answer
182 views

Changing text in text file [duplicate]

Is there a command line way to change text in the file? Like say I would like to change all strings "lukuunottamatta" to the form "lukuun ottamatta" and "Lukuunottamatta" to the form "Lukuun ottamatta"...

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