CODEWITHSUNDEEP
ruby
Dover Hellfeldt
Dover Hellfeldt

Reputation: 13

How to get input from a user with ARGV in Ruby to read a file?

I'm trying to read the content of a file (myfile.txt) through ARGV in Ruby. Here is my code:

filename = ARGV.first

puts "Here's your file #{filename}:"

print txt.read

What I have to do to pass the name of the file to ARGV?

Upvotes: 1

Views: 1951

Answers (3)

akuhn
akuhn

Reputation: 27823

Best use

ARGF.read

Notice the spelling with an ...F

ARGF is a stream of either all files named in the arguments, or standard input if no file has been named. This is best practice for scripts and allows your program to be used with a unix pipe.

cat filename | ruby script.rb
ruby script.rb filename

Will both work and do the same if you use ARGF.

Upvotes: 1

Eric Duminil
Eric Duminil

Reputation: 54303

Solution

With a ruby script called read_file.rb :

# read_file.rb
# example :
# ruby read_file.rb some_file.txt
filename = ARGV.first

puts "Here's your file #{filename}:"

print File.read(filename)

You can call :

ruby read_file.rb myfile.txt

Your code

print txt.read

txt isn't defined. If you meant filename, filename is a String which contains a filename. It's not a File object, so you cannot call filename.read directly.

Upvotes: 1

Karthik P R
Karthik P R

Reputation: 134

Try the following.

file = ARGV.first

file_name_with_extn = File.basename file        # => "abc.mp4"

file_extn = File.extname  file                  # => ".mp4"

file_name = File.basename file, extn            # => "abc"

file_path = File.dirname  file                  # => "/path/"

Upvotes: 0

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