List all user-installed packages on OpenWrt - requires bash, and produces a more minimal list then other similar scripts.

opkguinstalled

#! /bin/bash

#
# We use bash associative arrays indexed by the package name.
#

opkg status \* | {
    declare -A packages
    declare -A packages_depends
    declare -A packages_skip
    declare -A packages_time

    while read -r line; do
       case "$line" in
         "Package: "* )
             name="${line:9}"
             packages["$name"]="$name"
         ;;

         "Depends: "* )
            [ ! -v name ] && continue
            # strip the leading label
             line="${line:9}"

             # strip version specs
             line="${line//(=*)/ }"

             # strip trailing commas
             line="${line//,\ /\ }"

#echo packages_depends["${name}"]="$line"
             packages_depends["${name}"]="$line"
         ;;

         "Installed-Time: "* )
             [ ! -v name ] && continue
             time="${line:16}"
             if [ ! -v OLDEST_TIME ] || [ "$time" -lt "$OLDEST_TIME" ]; then
             	OLDEST_TIME="$time"
             fi

             packages_time["${name}"]="${line:16}"
         ;;

         "Auto-Installed: yes" )
             [ ! -v name ] && continue
             packages_skip["${name}"]=1
         ;;

         "" ) # Empty line delinenates individual package blocks
             unset name
         ;;
       esac
    done


    # pass over all the packages with dependancies, and mark the packages they 
    # depend on to be skipped (since they are an implied install).
    for name in "${!packages_depends[@]}"
    do
        # as package names can have shell special characters in them,
        # roll our own list processing, paying attention only to spaces.

        depend_list="${packages_depends["$name"]}"

        # take each item upto the next space (skipping all leading spaces)
        while [[ $depend_list =~ ([^[:space:]]+)(.*) ]]; do 
            # mark this dependancy to be skipped.
            packages_skip["${BASH_REMATCH[1]}"]=1

            # update list
            depend_list="${BASH_REMATCH[2]}";
        done
    done

#echo "${!packages[@]}"

    # now print the name of all the "not skipped" packages which were not
    # installed at the very beginning.

    for name in "${!packages[@]}"
    do
        [ ! -v packages_skip["${name}"] ] && [ "${packages_time["${name}"]}" -gt "${OLDEST_TIME}" ] && echo "${name}"
    done | sort

}