execute commands
IN RUBY
Szubrycht Kamil
Ruby Talks #5
STANDARD STREAMS
http://img.c4learn.com/2010/01/Stdstreams-notitle.svg_.png
execute commands
exec 'echo "Hello World!"'exec
- replaces the current process by running the given command
execute commands
system('echo "Hello World!"')system
- true if the command was successfully performed ( exit status zero )
- false for non zero exit status
- nil if command execution fails
execute commands
`echo "Hello World!"`backtick
- returns stdout
execute commands
i, o, e, t = Open3.popen3('echo "Hello World!"')popen3
- returns stdin, stdout, stderr and wait_thr
execute commands
Open3.popen3('echo "Hello World!"') do |i, o, e, t|
puts "stdout: #{o.read}"
puts "stderr: #{e.read}"
t.value.success?
endpopen3