Data commit

Task/Execute-a-system-command/Ruby/execute-a-system-command.rb

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+string = `ls`
+# runs command and returns its STDOUT as a string
+string = %x{ls}
+# ditto, alternative syntax
+
+system "ls"
+# runs command and returns its exit status; its STDOUT gets output to our STDOUT
+
+print `ls`
+#The same, but with back quotes
+
+exec "ls"
+# replace current process with another
+
+# call system command and read output asynchronously
+io = IO.popen('ls')
+# ... later
+io.each {|line| puts line}