postinst is in libgs9-common 9.18~dfsg~0-0ubuntu2.
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 12 13 | #!/bin/sh
# postinst script for libgs9.18-common
set -e
update-alternatives --install /usr/share/ghostscript/current \
ghostscript-current \
/usr/share/ghostscript/9.18 \
`echo '9.18' | sed -e 's/\.//'` || true
exit 0
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