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sudo ufw allow :port : Open a port in netfilter firewall
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sudo ufw deny :port : Close a port in netfilter firewall
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sudo ufw disable : : Disable netfilter firewall
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mkisofs -V LABEL -r dir | gzip > cdrom.iso.gz :isoname.iso.gz : Create cdrom image from contents of directory
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cdrecord -v dev=/dev/cdrom -audio -pad *.wav : : Make audio CD from all wavs in current dir
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dpkg-query -W -f='${Installed-Size;10}\t${Package}\n' | sort -k1,1n : : List all installed packages by size