This file is indexed.

postinst is in lua5.1 5.1.5-8.1build2.

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.

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#!/bin/sh -e

case "$1" in
    configure)
        update-alternatives \
            --install /usr/bin/lua lua-interpreter /usr/bin/lua5.1 110 \
            --slave /usr/share/man/man1/lua.1.gz lua-manual \
                /usr/share/man/man1/lua5.1.1.gz
        update-alternatives \
            --install /usr/bin/luac lua-compiler /usr/bin/luac5.1 110 \
            --slave /usr/share/man/man1/luac.1.gz lua-compiler-manual \
                /usr/share/man/man1/luac5.1.1.gz
        ;;
esac