nspipe example

tail.rb

framework 'cocoa'

outpipe = NSPipe.pipe

task = NSTask.alloc.init
task.setLaunchPath '/usr/bin/tail'
task.setArguments  %w(-f -n10 /Users/jch/projects/pharmmd/log/wendy.log)
task.setStandardOutput outpipe

file = outpipe.fileHandleForReading

task.launch

while true
  puts "-----"
  lines = file.availableData.to_str.split("\n")
  puts "#{lines.size} lines"
  puts lines.inspect
  sleep 15
  puts "-----\n"
end