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    Actually, he probably doesn't want a here string, either. cal takes its parameters as arguments, not stdin. Commented Oct 7, 2014 at 19:39
  • That's true, but with here string cal at least outputs something, although not what one could expect. Commented Oct 7, 2014 at 19:43
  • im trying to use cal commands to validate dates and i get the error Commented Oct 7, 2014 at 21:20
  • while [[ $# -ne [1-8] ]]; do cal <<< ( $year $month $day ) done echo $year $month $day is valid date "check" 71L, 1821C written hgolmohammadi1@matrix:~/Lab2> check 1989 06 17 ./check: line 69: syntax error near unexpected token (' ./check: line 69: cal <<< ( $year $month $day )' Commented Oct 7, 2014 at 21:21
  • k i checked everything and the only problem i get is when i run this check 1989 06 16 it gives me ./check: line 68: [: [1-8]: integer expression expected Commented Oct 7, 2014 at 22:02