Re: How to read out plist information and compare version number?
Re: How to read out plist information and compare version number?
- Subject: Re: How to read out plist information and compare version number?
- From: Greg Neagle <email@hidden>
- Date: Thu, 13 Nov 2008 09:25:22 -0800
python has a nice module to handle this sort of thing:
look at `pydoc disutils.version`
-Greg
On Nov 13, 2008, at 9:05 AM, Adam Peck wrote:
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" <email@hidden
>
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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