Input/Output
File Stream
Read/Write from/to an opened stream.
To read a file we can use open
with the correct modifier and then read its contents with a proper method:
r
: read only streamr+
: read and write stream
If open
is followed by a block, the file object is passed to the block and the stream is automatically closed at block termination. Inside the block, you have a file object, and you can use different methods as read
, each
, readline
and gets
among more. Thee methods can be used with many optional arguments in order to perform position dependent and length dependent reading.
Read
File.open("multi_line.txt", "r") do |file|
contents = file.read
puts contents
end
# read can be also used without opening the file
content = File.read("multi_line.txt")
# readline is similar to read but it can be used to obtain an array
# containing the lines of the file:
File.readlines("multi_line.txt")
# each can also be used to read a file line by line
file = File.new("multi_line.txt", "r")
count = 0
file.each do |line|
puts "n:#{count} #{line}"
counts+=1
end
Write
Working with Nmap files
Last updated