Re: How to read out plist information and compare version number?

13 Nov 2008

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Thread-topic: How to read out plist information and compare version number?
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Hi,

You cannot compare versions as strings because this will almost never work
as intended.  You must split them into their parts and compare those.  This
perl snippet should give you some idea on what should be done:

# Versions are compared fist on MajorVersion then Minor then Build and then
Patc
h number.
sub versionCmp
{
        my @verA = split(/\./, $_[0]);
        my @verB = split(/\./, $_[1]);

        for my $i (0 .. scalar(@verA)-1)
        {
                return 1 if ($verA[$i] < $verB[$i]);
                return -1 if ($verB[$i] < $verA[$i]);
        }
        return 0;
}

On 13/11/08 9:59 AM, "David Schara" <David.Schara@Native-Instruments.de>
wrote:
...
Hi,
I tried to create a bash file that should be able to read out an
application version number which is located in a plist and compare it to
a different version number. Both version numbers have the same
appearance: x.y.zzz
This is my code:
______
#!/bin/sh
# postflight
VERSION_NEW="0.5.002"
VERSION=defaults read "/Applications/My.app/Contents/Info"
"CFBundleShortVersionString"
echo $VERSION
if[$VERSION_NEW -lt $VERSION]; then
    echo "Version is bigger"
else
    echo "Version is smaler"
fi
______
I know there must be something wrong with the if-clause because I try to
compare two Strings , but I have no clue how to treat a version number
correctly. Also I get a strange error message (read:
`/Applications/Maschine.app/Contents/Info': not a valid identifier).
What is wrong there?
THX
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Re: How to read out plist information and compare version number?

Adam Peck