Shell Programming and Scripting

hello everyone, i have a couple of questions about programming with shell scripts.

-My question is, how do you find out how long a sequence of numbers that has just been entered is. for example

If i enter 12345 the length here is 5
and 23456789 the length here is eight.

I want to be able to do an if statment that says if the string of numbers are a certain length do somthing, else do somthing.

-My last question, how do you tell your program that if you have a number, and you divide it by another number to do one thing if it divides evenly and something else if it is not? for example

lets say i have a while statement, and i want to say while the number i have is not evenly divisiable then display a message, but as soon as it can be evenly divided display a different message. And i do have a way of changing the number i am dividing by each time.

Thanks

doing 'man ksh' yields:

Code:

     ${#parameter}
           String Length. The length in characters of  the  value



SunOS 5.9           Last change: 24 Mar 2003                   14






User Commands                                              ksh(1)



           of  parameter.  If  parameter  is * or @, then all the
           positional parameters, starting with $1,  are  substi-
           tuted (separated by a field separator character).

look into 'man bc' for the 'modulo' operand.