Re: OT:korn shell and arithmetic

On 06/22/2004 11:27:12 PM, Tim Gorman wrote:
> Sorry, my friend, but that doesn't work...
>
> $ if [ 1.2 > 1.0 ]; then
> > echo "yes"
> > else echo "no"
> > fi
> yes
>
> $ if [ 1.2 > 1.3 ]; then
> > echo "yes"
> > else echo "no"
> > fi
> yes
>
> The following is rather annoying, but it seems to work...
>
> $ if [[ "`bc << __EOF__^J1.2 > 1.0^J__EOF__`" = "1" ]]
> > then
> > echo yes
> > else echo no
> > fi
> yes
>
> $ if [[ "`bc << __EOF__^J1.2 > 1.3^J__EOF__`" = "1" ]]
> > then
> > echo yes
> > else echo no
> > fi
> no
>

Hey Tim, long time no see! It seems that "-gt" is the correct comparison operator for the numerical values. Other then that, pdksh has only integer arithmetic implemented. Here is a revised version, without those pesky decimal points:

$ cat /tmp/ttt;/tmp/ttt
#!/bin/ksh
if [ 2 -gt 3 ]; then
echo "yes";
else echo "no";
fi;
if [ 3 -gt 2 ]; then
echo "yes";
else echo "no";
fi;
no
yes
$

My preferred shell (all right, it's an interpreter, not a shell) for that kind of tricks is perl.

It looks much nicer:
$ cat /tmp/ttt;/tmp/ttt
#!/usr/bin/perl

if (1.2 > 1.3) { print "yes\n"; }
else           { print "no\n"; }
if (1.3 > 1.2) { print "yes\n"; }
else           { print "no\n"; }
                                                                                

print "The sum is:", 1.2+1.3,"\n";
no
yes
The sum is:2.5
$

-- 
Mladen Gogala
Oracle DBA
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