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May 26th, 2009

command line argument -- ruby

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i'm a java c/c++ person. trying out ruby for the 1st time!

how do i do something like this in ruby:

Ruby Syntax (Toggle Plain Text)
//this is java 
public static void main ( String args [] ) {
	File inFile  = new File ( args [ 0 ] ); 
        File outFile = new File ( args [ 1 ] );
DataInputStream reader = new DataInputStream ( new BufferedInputStream ( new FileInputStream ( inFile ) ) );
		BufferedWriter writer = new BufferedWriter ( new FileWriter ( outFile ) );
String str;
while (str = reader.readline() != null){
writer.write (str);
}
}
//this is java 
public static void main ( String args [] ) {
	File inFile  = new File ( args [ 0 ] ); 
        File outFile = new File ( args [ 1 ] );
DataInputStream reader = new DataInputStream ( new BufferedInputStream ( new FileInputStream ( inFile ) ) );
		BufferedWriter writer = new BufferedWriter ( new FileWriter ( outFile ) );
String str;
while (str = reader.readline() != null){
writer.write (str);
}
}

note that this code may not compile i pulled it off of a java program i did a while back.

drjay

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drjay1627

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Jun 3rd, 2009

Re: command line argument -- ruby

well i figured it out btw. so for anyone in the future looking to do something similar to the java code above:

Ruby Syntax (Toggle Plain Text)
#arguments
inFile = ARGV[0] 
outFile = ARGV[1]
 
def foo(infile, outfile)
	begin
		puts "Opening input file..."
		fin = File.open(inFile, "r")
		puts "Creating output file..."		
		fout = File.open(outFile, "w")
		puts "Reading from input file and writing to output file..."		
		str = ins.readlines()
		fout.puts str
		puts "Closing files..."
		fin.close
		fout.close
		puts "Process complete!"
	rescue => err
		puts "Exception: #{err}"
		err
	end
end
 
foo(inFile,  outFile)
#arguments
inFile = ARGV[0] 
outFile = ARGV[1]

def foo(infile, outfile)
	begin
		puts "Opening input file..."
		fin = File.open(inFile, "r")
		puts "Creating output file..."		
		fout = File.open(outFile, "w")
		puts "Reading from input file and writing to output file..."		
		str = ins.readlines()
		fout.puts str
		puts "Closing files..."
		fin.close
		fout.close
		puts "Process complete!"
	rescue => err
		puts "Exception: #{err}"
		err
	end
end

foo(inFile,  outFile)

takes in 2 files as command line arguments. 1st file being the input file and the second being the output file. then it writes the input to the output file.

happy coding

drjay!

drjay1627

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Jun 12th, 2009

Re: command line argument -- ruby

Guess I'm late for the party but a simpler way of doing it would be:

ruby Syntax (Toggle Plain Text)
require 'fileutils'
FileUtils.copy_file(ARGV[0], ARGV[1])
require 'fileutils'
FileUtils.copy_file(ARGV[0], ARGV[1])

~s.o.s~

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