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#!/bin/bash
set -e
print_help() {
cat <<EOF
Usage: $(basename "$0") COMPONENT
COMPONENT - name of component (ex.: contrib, non-free)
EOF
exit 1
}
list_installed() {
dpkg -l | grep '^ii' | cut -d ' ' -f 3 | cut -d ':' -f 1 | sort -u
}
list_packages() {
component="$1"
grep '^Package:' /var/lib/apt/lists/*_"${component}"_*Packages | cut -d ' ' -f 2 | sort -u
}
if [ $# -lt 1 ] ; then
print_help
fi
comm -12 <(list_installed) <(list_packages "$1")
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