Re: bash question

[Luca Ferrari <fluca1978@virgilio.it>]

On Thursday 01 April 2004 02:45 Scott@Charter's cat walking on the keyboard  
wrote:

> I can't get this bash script to work.  It's suppose to print all odd
> numbers from 1 to 10.
>
> #!/usr/bin/bash
>
> LIMIT=10
> a=1
>
> while [ "$a" -le $LIMIT ]
> do
>   if [ "$a" -eq $(1 3 5 7 9) ]     <---------Something not right here.

This is an awkard way to print all odd numbers, have a look at this:

#!/bin/bash

LIMIT=10
a=1

while test ${a} -lt ${LIMIT}
do
  go=`expr ${a} % 2`
  if test ${go} -ne 0
      then
      echo "Odd number ${a}"
  fi

  a=`expr ${a} + 1`

done


exit 0


In this example, if you change the LIMIT value to 100, the script will print 
you all odds numbers, while in your example you have to put numbers by your 
own. In perl it can result as:

#!/usr/bin/perl

$LIMIT=10;
$a=1;

    while( $a < $LIMIT ){
        if( ($a % 2) !=0 ){
            print "Odd number $a\n";
        }
        $a++;
    }

exit;


Luca


-- 
Luca Ferrari,
fluca1978@virgilio.it