How to search and replace a content of a file using shell script?

Question

I have started learning shell scripting a few days ago. My scenario is, i have to search and replace a content which exists in different lines in a file using shell script.

For Example, I have mentioned the path name in a file :-

path = /home/test/db

My name is so and

path = /home/test/db

Here, The path name "/home" has to be replaced with "/Second" in specified lines of the file using shell script. By using "sed" command i have tried and replaced the content of the file has only one line but i am struggling with replacing which is present in different lines. I am using "If" condition in shell script.Please do help me in resolving this case.

Thanks and Regards,

Drona · Accepted Answer · 2011-11-10 15:44:38Z

1

I believe you missed the g option in your sed command. See below

sed "s/find/replace/g" filename

answered Nov 10, 2011 at 15:44

Drona

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7 Comments

Drona Over a year ago

s stands for substitute command to sed and g stands for global which means to substitute all occurences of the text matching the regular expression indicated by the find by the text indicated by replace

user626206 Over a year ago

Thanks for your precious reply will try and update. Once again thanks.

glenn jackman Over a year ago

As the find and replace portions appear to be paths, using a different delimiter will likely be helpful: sed 's!/path/one!/path/two!g

user626206 Over a year ago

Hi @Vikas Nalwar, Works fine. Your help is really appreciated. Once again thanks.

user626206 Over a year ago

Hi @Vikas Nalwar, For example: sed "s/raj/ravi/g" here ravi is placed in another file. The reason behind, i am getting the word as an input using "read word" and writing the word to another file. So i want to read the word "ravi" from other file and replaced to another file. Please help me on this.Please provide me the example

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Paritosh Yadav · Accepted Answer · 2018-04-10 04:21:34Z

0

sed -i 's/original/new/g' file.txt

Explanation:

sed = Stream EDitor -i = in-place (i.e. save back to the original file) The command string:

s = the substitute command

original = a regular expression describing the word to replace (or just the word itself)

new = the text to replace it with

g = global (i.e. replace all and not just the first occurrence)

file.txt = the file name

answered Apr 10, 2018 at 4:21

Paritosh Yadav

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Comments

vikram jeet singh · Accepted Answer · 2018-05-08 02:21:43Z

0

The below mentioned code will search all JS files under "search_folder_name". It will find "version_number" for all occurrences in the defined folder and replace it with respective value defined. Save the below menioned code in .sh file say, test.sh

#!/bin/bash
versionNo=0.0.1
find ./search_folder_name/ -name \*.js -type f -print0 | while read -d $'\0' file; do
    echo "Processing $file"
    sed -i '' 's/{version_number}/'$versionNo'/g' $file
done

answered May 8, 2018 at 2:21

vikram jeet singh

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