postinst is in powerwake 2.18-0ubuntu2.
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 | #!/bin/sh -e
PKG="powerwake"
if [ "$1" = configure ] || [ "$1" = reconfigure ]; then
getent group admin > /dev/null 2>&1 || addgroup --system --quiet admin
mkdir -p /var/cache/$PKG
touch /var/cache/$PKG/ethers
chown root:admin /var/cache/$PKG/ethers
chmod 664 /var/cache/$PKG/ethers
fi
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