/Shell/Bash/Find installed packages in ubuntu

Find installed packages in ubuntu

# This returns only the manually installed packages and only the package name (no extra info etc)
comm -23 <(apt-mark showmanual | sort -u) <(gzip -dc /var/log/installer/initial-status.gz | sed -n 's/^Package: //p' | sort -u)

Source: askubuntu.com

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