How do I replace a line in a file in bash?

How do I replace a line in a file in bash?

To replace content in a file, you must search for the particular file string. The ‘sed’ command is used to replace any string in a file using a bash script. This command can be used in various ways to replace the content of a file in bash. The ‘awk’ command can also be used to replace the string in a file.

How do I replace a word in a bash script?

The procedure to change the text in files under Linux/Unix using sed:

1. Use Stream EDitor (sed) as follows:
2. sed -i ‘s/old-text/new-text/g’ input.
3. The s is the substitute command of sed for find and replace.
4. It tells sed to find all occurrences of ‘old-text’ and replace with ‘new-text’ in a file named input.

How do I edit a file in bash?

Edit a file via bash script

1. Open file /etc/yum.repos.d/epel.repo.
2. Find [epel] section.
3. Add a line priority=10 just after line enabled=1 in the epel section.

How to replace entire line in text file by Bash?

I’m not trying to replace some sub-string in that line, I just want to replace that line entirely with a new line. Are there any bash methods for doing this (or something simple that can be thrown into a .sh script). where N should be replaced by your target line number. This replaces the line in the original file.

Can you use a string substitution in Bash?

If the file you are working on is not so big, and temporarily storing it in a variable is no problem, then you can use Bash string substitution on the whole file at once – there’s no need to go over it line by line: The whole file contents will be treated as one long string, including linebreaks.

Is the line number always the same in Bash?

The line number is always the same, so that can be a hard-coded variable. I’m not trying to replace some sub-string in that line, I just want to replace that line entirely with a new line. Are there any bash methods for doing this (or something simple that can be thrown into a .sh script). where N should be replaced by your target line number.

What happens if I change one file to another in Bash?

However, your owner, group, and permissions of the second file will be unchanged. If file2 does not exist, then file1 is renamed file2. If file2 exists, its contents are replaced with the contents of file1.