larguraDaLinha = 40
str = '--> text <--'
puts str.ljust(larguraDaLinha)
puts str.center(larguraDaLinha)
puts str.rjust(larguraDaLinha)
puts str.ljust(larguraDaLinha/2) + str.rjust(larguraDaLinha/2)
#https://pt.stackoverflow.com/q/236001/101
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