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grep

grep expression filename

ll /etc/apt/sources.list
cat /etc/apt/sources.list
grep security /etc/apt/sources.list
grep -v security /etc/apt/sources.list
grep '#' /etc/apt/sources.list
grep '# ' /etc/apt/sources.list
grep '^# ' /etc/apt/sources.list


grep -v '#' /etc/apt/sources.list
grep -v '#' /etc/apt/sources.list | grep security