Piping data in on the command line

[James Coglan]

[Note: parts of this message were removed to make it a legal post.]

Hello all,

I know you can get command line args using ARGV, but is there a way to use
the '<' operator to pipe data into your program, as in

ruby myprog.rb < ~/myfile.txt

 

[Sandor Szücs]

I know you can get command line args using ARGV, but is there a way =20=

to use
the '<' operator to pipe data into your program, as in

AFAIK that's called I/O redirection.

ruby myprog.rb < ~/myfile.txt

$ ruby cat.rb < cat.rb
puts *ARGF


regards, Sandor Sz=FCcs
--

 

[Martin Boese]

Just read the IO $stdin, like:

$stdin.each { |line| puts "Found: #{line}" }

The < "operator" is a shell feature that will pass the content of a file to
the programs standard input (stdin).

martin

 

[Sandor Szücs]

Just read the IO $stdin, like:

$stdin.each { |line| puts "Found: #{line}" }

The < "operator" is a shell feature that will pass the content of a =20=

file to
the programs standard input (stdin).

Maybe that's more readable, but my point wasn't the shell feature < .
cat.rb has one line:
puts *ARGF

$ ruby cat.rb < cat.rb
puts *ARGF


regards, Sandor Sz=FCcs
--

 

[James Coglan]

Maybe that's more readable, but my point wasn't the shell feature < .
cat.rb has one line:
puts *ARGF

Thank you both. If anyone is the least bit interested I'm writing myself ye=
t
another commandline option parser:

http://github.com/jcoglan/oyster

It's inspired by trollop, but it has some more option types and is more
easily extensible, automates a few extra things (like recognizing
--no-verbose if you've got a --verbose option for example) and it generates
slightly nicer (more man-page-like) help text.

 

[ara.t.howard]

Thank you both. If anyone is the least bit interested I'm writing
myself yet
another commandline option parser:

http://github.com/jcoglan/oyster

It's inspired by trollop, but it has some more option types and is
more
easily extensible, automates a few extra things (like recognizing
--no-verbose if you've got a --verbose option for example) and it
generates
slightly nicer (more man-page-like) help text.

you may be interested in

http://codeforpeople.com/lib/ruby/main/main-2.8.1/README

http://codeforpeople.com/lib/ruby/main/main-2.8.1/samples/

gem install main


the whole concept is to obviate the notion of ever parsing options

cheers.

a @ http://codeforpeople.com/