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fib.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)?action=history&offset=20080131185251
 # 
 # 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
 # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 # IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 # 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.
 # 
 # Retrieved from: http://en.literateprograms.org/Fibonacci_numbers_(sh)?oldid=12447
 
 fib () {
         n=$1
 
         if test $n -lt 2 ;then
                 echo "$n"
 
         else
                 echo "`fib $(echo $n-1 | bc)`+`fib $(echo $n-2 | bc)`" | bc
         fi
 }
 
 for n in 1 2 3 4 5 6 7 8 9 10; do
         echo "fib $n = `fib $n`"
 done