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Epoch dates for the start and end of the year/month/day Convert seconds to days, hours and minutes What is epoch time? The Unix epoch (or Unix time or POSIX time or Unix timestamp) is the number of seconds that have elapsed since January 1, 1970 (midnight UTC/GMT), not counting leap seconds (in ISO 8601: 1970-01-01T00:00:00Z). Literally speaking the epoch is Unix time 0 (midnight 1-1-1970), but 'epoch' is often used as a synonym for 'Unix time'. Many Unix systems store epoch dates as a signed 32-bit integer, which might cause problems on January 19, 2038 (known as the Year 2038 problem or Y2038).
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SORTING BY IP ADDRESS
If you ever need to sort a file by IP
address, this little command line will
serve you well:
# sort -t . -k 1,1n -k 2,2n -k 3,3n -k 4,4n
It will correctly sort IP addresses from
the first octet numerically, then each
following octet.
