# Fibonacci numbers with sh

prev=0;next=1;echo \$prev;while(true);do echo \$next;sum=\$((\$prev+\$next));prev=\$next;next=\$sum;sleep 1;done

0
2009-09-06 09:38:10

## 4 Alternatives + Submit Alt

• Another combination of seq and awk. Not very efficient, but sufficiently quick. Show Sample Output

14
seq 50| awk 'BEGIN {a=1; b=1} {print a; c=a+b; a=b; b=c}'
· 2009-03-24 20:39:24
• recursive version, "pure" AWK Show Sample Output

5
awk 'func f(n){return(n<2?n:f(n-1)+f(n-2))}BEGIN{while(a<24){print f(a++)}}'
· 2010-11-24 10:40:08
• Does not require input to function or complete. Number of iterations controlled by shell variable \$NUM. Show Sample Output

0
awk 'BEGIN {a=1;b=1;for(i=0;i<'\${NUM}';i++){print a;c=a+b;a=b;b=c}}'
· 2009-09-06 03:05:55
• only take the first field on each row to compute the fibo on this number Show Sample Output

-5
gawk '{n=\$1;a=0;b=1;c=1;for(i=1;i<n;i++){c=a+b;a=b;b=c};print c}' << eof
· 2010-11-26 08:36:30

### What Others Think

A variant of the bash solution that should work with all Bourne descendants that have \$(( )) arithmetic evaluation: `a=1;b=1;for i in \$(seq 1 40);do echo \$a;h=\$((a+b));a=\$b;b=\$h;done` Note that the shell's integers overflow rather quickly.
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pugpuppies95 · 60 weeks and 2 days ago

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