Shell Programming and Scripting

Hi,

I need some simple but time-consuming script, I would like to compare run time in different shells. I thought about factorial or exponentiation in many loop, but I don't know it's a good idea.

Do you know some simple, time-consuming (arithmetic) script ??
I would be thankful for every help and suggestion

cheers,
Paul.

Code:

i=1;j=1;while [ $i -lt 1000000 ]; do (( j = j + 1 )); ((i = i + 1 )); done;echo $j

cheers,
Devaraj Takhellambam

Yeah, I was thinking about some thing like that, maybe something more sophisticated , but not too much

why?
no one with any sense would do serious arithmetic in a shell script.

Yes, I know, it's just for test

fisher yates shuffle?

runtime in shell is largely a function of the number of builtins that you call. More builtins = fewer child processes created. Process creation is a resource hog.
In modern shells

Code:

a=4
b=3
# slow 
result=$(echo "$a * $b" | bc -l )
#faster
result=$(( $a * $b ))

So, comparing shells that do not have comparable builtins is not going to tell you much about the shell's performance ie., csh vs bash. cfajohnson knows about such things, he may comment for you.