Open3.popen3 or Open3.capture3:
Open3 actually just uses Ruby’s spawn command, but gives you a much better API.
Open3.popen3
Popen3 runs in a sub-process and returns stdin, stdout, stderr and wait_thr.
require 'open3'
stdin, stdout, stderr, wait_thr = Open3.popen3("sleep 5s && ls")
puts "#{stdout.read} #{stderr.read} #{wait_thr.value.exitstatus}"
or
require 'open3'
cmd = 'git push heroku master'
Open3.popen3(cmd) do |stdin, stdout, stderr, wait_thr|
puts "stdout is:" + stdout.read
puts "stderr is:" + stderr.read
end
will output: stdout is: stderr is:fatal: Not a git repository (or any of the parent directories): .git
or
require 'open3'
cmd = 'ping www.google.com'
Open3.popen3(cmd) do |stdin, stdout, stderr, wait_thr|
while line = stdout.gets
puts line
end
end
will output:
**Pinging www.google.com [216.58.223.36] with 32 bytes of data:
Reply from 216.58.223.36: bytes=32 time=16ms TTL=54
Reply from 216.58.223.36: bytes=32 time=10ms TTL=54
Reply from 216.58.223.36: bytes=32 time=21ms TTL=54
Reply from 216.58.223.36: bytes=32 time=29ms TTL=54
Ping statistics for 216.58.223.36:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 10ms, Maximum = 29ms, Average = 19ms**