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When you use a system call in a Ruby script, you can get the output of that command like this:
output = `ls`
puts output
That's what this question was about.
But is there a way to show the continuous output of a system call? For example, if you run this secure copy command, to get a file from a server over SSH:
scp user@someserver:remoteFile /some/local/folder/
... it shows continuous output with the progress of the download. But this:
output = `scp user@someserver:remoteFile /some/local/folder/`
puts output
... doesn't capture that output.
How can I show the ongoing progress of the download from inside my Ruby script?
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Ruby has another three methods for printing output. In the example, we present the p , printf and putc methods. The p calls the inspect method upon the object being printed. The method is useful for debugging.
The Ruby system method is the simplest way to run an external command. It looks like this: system("ls") Notice that system will print the command output as it happens. Also system will make your Ruby program wait until the command is done.
Press Ctrl twice to invoke the Run Anything popup and execute the ruby script. rb command. In this case, you can specify the required command-line options and script arguments right in the popup, for example, ruby -v script. rb .
Try:
IO.popen("scp -v user@server:remoteFile /local/folder/").each do |fd|
puts(fd.readline)
end
I think you would have better luck using the ruby standard library to handle SCP (as opposed to forking a shell process). The Net::SCP library (as well as the entire Net::* libraries) are full featured and used with Capistrano to handle remote commands.
Checkout http://net-ssh.rubyforge.org/ for a rundown of what is available.
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