Hi all,

I'm brand new to ruby, and I'm looking for a way to open a file, read 
its content and modify it. I've seen that I can open a file in read 
write mode, but I can't figure out how it works. If I want to replace 
all occurences of 'search' by 'replace', for instance, what do I have to 
do?

Searching for an answer to this question, I've found scripts using gsub! 
What is this exclamation mark?

Thanks in advance for your help!

Xavier

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