This file is indexed.

postinst is in ettercap-dbg 1:0.8.2-2build1.

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

set -e

# Replace documentation directory with symlink
docdir="/usr/share/doc/${DPKG_MAINTSCRIPT_PACKAGE}"
if [ -d ${docdir} -a ! -L $docdir ]; then
    if rmdir ${docdir} 2>/dev/null; then
        ln -sf /usr/share/doc/ettercap-common ${docdir}
    fi
fi

case "$1" in
    configure)
        ;;
esac