postinst is in openjdk-7-jre-lib 7u51-2.4.6-1ubuntu4.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | #! /bin/sh
set -e
multiarch=i386-linux-gnu
with_tzdata=yes
if [ "$with_tzdata" = yes ] && [ -z "$multiarch" ]; then
if [ ! -h /usr/lib/jvm/java-7-openjdk-i386/jre/lib/zi ] && [ -d /usr/lib/jvm/java-7-openjdk-i386/jre/lib/zi ]; then
rm -rf /usr/lib/jvm/java-7-openjdk-i386/jre/lib/zi
ln -s ../../../../../share/javazi /usr/lib/jvm/java-7-openjdk-i386/jre/lib/zi
fi
fi
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