Task

Run either the   ls   system command   (dir   on Windows),   or the   pause   system command.




Related task
  Get system command output


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}