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fibonacci.sh

 #!/bin/sh
 # Copyright (c) 2008 the authors listed at the following URL, and/or
 # the authors of referenced articles or incorporated external code:
 # http://en.literateprograms.org/Fibonacci_numbers_(sh,_iterative)?action=history&offset=20081026001608
 # 
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
 # "Software"), to deal in the Software without restriction, including
 # without limitation the rights to use, copy, modify, merge, publish,
 # distribute, sublicense, and/or sell copies of the Software, and to
 # permit persons to whom the Software is furnished to do so, subject to
 # the following conditions:
 # 
 # The above copyright notice and this permission notice shall be
 # included in all copies or substantial portions of the Software.
 # 
 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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 # CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 # TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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 # Retrieved from: http://en.literateprograms.org/Fibonacci_numbers_(sh,_iterative)?oldid=15303
 
 set -- 0 1
 while true; do
     echo $1
 
     set -- $2 $(dc -e "$1 $2 + p" | tr -cd "[0-9]")
      
 done