compare versions.

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# 1  
Old 07-11-2011
compare versions.

Hi ,
I have versions something like 1.10.0 and 1.9.1 and i want to compare them.
I wrote sample program like below.

my $var1 = "1.10.0";
my $var2 = "1.9.0";
if ($var1 eq $var2)
print "EQUAL\n";
if ($var1 gt $var2)
print "GREATER $var1 $var2\n";
if ($var1 lt $var2)
print "LOWER $var1 $var2\n";

This is printing LOWER ene though 1.10.0 is greater than 1.9.1.
Please help me how to compare these type of numbers.

Last edited by pludi; 07-11-2011 at 10:48 AM..
# 2  
Old 07-11-2011
They look like strings to me. Smilie

You may have to split them at the decimal and compare.
# 3  
Old 07-11-2011
Since they're not pure numbers, Perl is treating them like strings, and then the comparison follows the rules of the strcmp function. The first and second character in both are the same, but the third is different, and 1 comes before 9, and is thus considered lower.
# 4  
Old 07-11-2011
A ksh solution :
# Usage: $0 version1 version2

set -o nounset

oIFS="$IFS" ;IFS='.'
set -A v1 $1
set -A v2 $2

(( cnt1 > cnt2 )) && cnt=$cnt1 || cnt=$cnt2;

while (( i <= cnt ))
    (( n1 = ${v1[$i]-} + 0 ))
    (( n2 = ${v2[$i]-} + 0 ))
    if (( n1 > n2 ))
    elif (( n1 < n2 ))
    (( i += 1 ))

print ${result} $1 $2

$ ./cmpv.ksh 1.2.3 1.2.3
EQUAL 1.2.3 1.2.3
$ ./cmpv.ksh 1.2.4 1.2.3
GREATER 1.2.4 1.2.3
$ ./cmpv.ksh 1.2.4
LOWER 1.2.4

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