s = "hello\r\n" # A string with a line terminator
s.chomp! # => "hello": remove one line terminator from end
s.chomp # => "hello": no line terminator so no change
s.chomp! # => nil: return of nil indicates no change made
s.chomp("o") # => "hell": remove "o" from end
$/ = ";" # Set global record separator $/ to semicolon
"hello;".chomp # => "hello": now chomp removes semicolons and end
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