Tutorial by Topics: posix

VersionStandardRelease YearPOSIX.1IEEE Std 1003.1-19881988-01-01POSIX.1bIEEE Std 1003.1b-19931993-01-01POSIX.1cIEEE Std 1003.1c-19951995-01-01POSIX.2IEEE Std 1003.2-19921992-01-01POSIX.1-2001IEEE Std 1003.1-20012001-12-06POSIX.1-2004IEEE Std 1003.1-20042004-01-01POSIX.1-2008IEEE Std 1003.1-2008 (...
R includes two date-time classes -- POSIXct and POSIXlt -- see ?DateTimeClasses. Pitfalls With POSIXct, midnight will display only the date and time zone, though the full time is still stored. Related topics Date and Time Specialized packages lubridate
To quote from @SnoringFrog's topic-creation request: "One of the biggest gotchas using sed is scripts that fail (or succeed in an unexpected way) because they were written for one and not the other. Simple run-down of the more major differences would be good." macOS uses the BSD ver...

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