How do I find and replace a string in a file in Perl?

How do I find and replace a string in a file in Perl?

3 Answers. #!/usr/bin/perl -w use strict; open(FILE, “; close(FILE); foreach(@lines) { $_ =~ s//ABCD/g; } open(FILE, “>/tmp/yourfile. txt”) || die “File not found”; print FILE @lines; close(FILE);

How do you replace a line in a file using Perl?

To insert a line after one already in the file, use the -n switch. It’s just like -p except that it doesn’t print $_ at the end of the loop, so you have to do that yourself. In this case, print $_ first, then print the line that you want to add. To delete lines, only print the ones that you want.

How do I find a word in a string in Perl?

To search for a substring inside a string, you use index() and rindex() functions. The index() function searches for a substring inside a string from a specified position and returns the position of the first occurrence of the substring in the searched string.

How do you replace a string from a file in Unix?

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 replace a character in a file in Perl?

Replace content with pure Perl

1. my $filename = ‘README.txt’;
2. my $data = read_file($filename);
3. $data =~ s/Copyright Start-Up/Copyright Large Corporation/g;
4. write_file($filename, $data);
5. exit;
6. sub read_file {
7. my ($filename) = @_;

How to replace a string in a file in Perl?

How to replace a string in a File in Perl The perl -pi -e syntax to find and replace a string is as follows: perl -pi -e ‘s/ old-word / new-word /g’ input.file perl -pi -e ‘s/old/new/g’ *.conf

How to find and replace specific string in multiple text files?

With that in mind, here is a perl solution with friendly output for anyone that runs across this question.

How to replace a string in Bash with Linux?

The syntax is for bash version 4.x+: For instance, replace a string ‘Unix’ with ‘Linux’: Here is another bash string manipulation example that replaces all occurrences of ‘Linux’ with ‘Unix’: message = “I love Linux. Linux is awesome but FreeBSD is better too.

How to replace a string with another word?

The perl can be also used as described below to replace a string with another string/word in all files. GNU sed command can edit files in place (makes backup if extension supplied) using the -i option.