Show the manually installed packages (Ubuntu/Debian) (Alias)

# http://ask.debian.net/questions/how-to-get-a-list-of-manually-installed-packages
installed_packages1() {
    aptitude search '~i !~M'
}
# ------------------------------------------------
# Thanks to Nik05 in #Debian @ freenode
installed_packages2() {
    aptitude search '~i !~M !~E !~prequired !~pimportant !~pstandard'
}
# ------------------------------------------------
# http://askubuntu.com/a/492343
installed_packages3() {
    comm -23 <(apt-mark showmanual | sort -u) <(gzip -dc /var/log/installer/initial-status.gz | sed -n 's/^Package: //p' | sort -u)
}
# ------------------------------------------------
installed_packages4() {
    comm -23 <(aptitude search '~i !~M' -F '%p' | sed "s/ *$//" | sort -u) <(gzip -dc /var/log/installer/initial-status.gz | sed -n 's/^Package: //p' | sort -u)
}
# ------------------------------------------------
installed_packages5() {
## List all manually installed packages on a debian/ubuntu system
## manually installed means:
##   1. not pre-installed with the system
##   2. not marked auto-installed by apt (not dependencies of other
##      packages)
## Note: pre-installed packages that got updated still needs to be
##   filtered out.

parse_dpkg_log() {
    {
        for FN in `ls -1 /var/log/dpkg.log*` ; do
            CMD="cat"
            [ ${FN##*.} == "gz" ] && CMD="zcat"
            $CMD $FN | egrep "[0-9] install" | awk '{print $4}' \
                | awk -F":" '{print $1}'
        done
    } | sort | uniq
}

## all packages installed with apt-get/aptitude
list_installed=$(parse_dpkg_log)
## packages that were not marked as auto installed
list_manual=$(apt-mark showmanual | sort)

## output intersection of 2 lists
comm -12 <(echo "$list_installed") <(echo "$list_manual")
}
# ------------------------------------------------
# By me... the DeaDSouL ;)
installed_packages_aptitude() {
    while read f; do
        f="${f##* }"
        echo "${f%%:*}"
    done < <(cat /var/log/aptitude | grep -i '\[install\]')
}
# ------------------------------------------------
# By me... the DeaDSouL ;)
installed_packages_apt() {
    while read f; do
        echo "${f##*install }"
    done < <(cat /var/log/apt/history.log | grep 'apt-get *install')
}
# ------------------------------------------------
# By me... the DeaDSouL ;)
# Modified by EriC^^ in #Ubuntu @ freenode .. Thanks :)
installed_packages_apt2() {
    while read f; do
        echo "${f##*install }"
    done < <(cat /var/log/apt/history.log && zcat /var/log/apt/history.log.* | grep -i 'apt-get .*install')
}