Gsub! on a txt file

Ruby
1

Hello!

I’m a complete newbie in Ruby’s world!

I’m just messing around with codings in disparate arguments.
Here, I’m trying to do a program which takes the text in a .txt file and
changes values by gsub! method!

The snag I’m encountering is when I have to make Ruby understand that it
has to consider the text inside a file!

file = File.open("/R/testo.txt", “r”)

text = (file.each {|line| print line }).to_s

text.to_s
text.gsub!(/o/,"*")

That’s what I’ve done, but it limits itself to print the text…!

How can I do?

Thanks a lot!

Cheers

2

That’s what I’ve done, but it limits itself to print the text…!

How can I do?

text = File.read(’/R/testo.txt’)
text.gsub!(/o/, “*”)
puts text

3

Ohhhh I didn’t know this method!

Thank you a lot :slight_smile:

4

Leo M. wrote in post #978439:

file = File.open("/R/testo.txt", “r”)

text = (file.each {|line| print line }).to_s

text.to_s
text.gsub!(/o/,"*")

Processing one line at a time is a good idea because it lets you handle
files bigger than will fit into memory.

This can be as simple as:

file = File.open("/R/testo.txt")
file.each { |line| print line.gsub!(/o/,"*") }

Or better, like this:

File.open("/R/testo.txt") do |file|
file.each { |line| print line.gsub!(/o/,"*") }
end

The second version will automatically close the file at the end of the
block.

I’d prefer “each_line” to “each”. Not only is it clearer, but ‘each’ for
strings was removed from ruby 1.9 (although oddly not from files)