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problems with If

 
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# 1  
Old 01-04-2009
problems with If
I'm having problems uses "if"

it works fine when i do this.

#!/bin/sh

 a= 10
qw= 2
w= 20
{
if [ $a -ge $qw ] && [ $a -lt $w ];then
echo 3
fi
}

However if i try to do

#!/bin/sh

 a= 10
qw= 2.5
w= 20.3
{
if [ $a -ge $qw ] && [ $a -lt $w ];then
echo 3
fi
}

It stops work, does any one know if there's a way to use if with decimal points?

cheers
Ps. sorry about the spelling.
# 2  
Old 01-04-2009
You are NOT "having problem using 'if'".
You are having a problem comparing decimal numbers.

This was answered here years ago:

https://www.unix.com/shell-programmin...l-numbers.html
# 3  
Old 01-05-2009
Hi,

We are using AIX flavour and the decimal number comparison is working fine.

Pls let me know if this is because of the unix flavour.

Thanks
# 4  
Old 01-05-2009
Hi,

Pls remove space while assigning value to variable. And try the same.

Hope this should work. Also pls post the error msg what you are getting.

Thanks
# 5  
Old 01-08-2009
I've manage to get it to work. i removed the spaces while assigning value to variables and replaced.

#!/bin/sh
 a= 10
qw= 2.5
w= 20.3
{
if [ $a -ge $qw ] && [ $a -lt $w ];then
echo 3
fi
}

with

#!/bin/sh
 a=10
qw=2.5
w=20.3

if awk 'BEGIN{if('$a'>='$qw')exit;exit 1}' && awk 'BEGIN{if('$a'<'$w')exit;exit 1}';then
echo 3
fi

Thanks for the help.
# 6  
Old 01-08-2009
Quote:
Originally Posted by Gayucvns
Hi,

We are using AIX flavour and the decimal number comparison is working fine.

Pls let me know if this is because of the unix flavour.

Thanks
yes. You are probably using ksh93. Try the following to confirm. Also note you should use (( )) instead of [[ ]] or [] when dealing with numbers in ksh93.
Code:
printf "KSH93 Version: ${.sh.version}\n"

a=10
qw=2.5
w=20.3

if (( a > qw )) && (( a < w ))
then
    printf "3\n"
fi

 
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