This file is indexed.

prerm is in imagemagick 8:6.7.7.10-5+deb7u4.

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 

if [ "$1" = "remove" ]
then
    # remove all alternatives
    for prog in compare animate convert composite conjure \
        import identify stream display montage mogrify; do 
        update-alternatives --remove $prog /usr/bin/$prog.im6
    done
fi

# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.