list directory contents
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-l (The letter ell.) Do not follow symbolic links named as operands unless the -H or -L options are
specified. Write out in long format (see the STDOUT section). When -l (ell) is specified, -1 (one)
shall be assumed.
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-t Sort with the primary key being time modified (most recently modified first) and the secondary key
being filename in the collating sequence.
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-r Reverse the order of the sort to get reverse collating sequence or oldest first.
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-a Write out all directory entries, including those whose names begin with a period ( '.' ). Entries
beginning with a period shall not be written out unless explicitly referenced, the -a option is
supplied, or an implementation-defined condition shall cause them to be written.
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-p Write a slash ( '/' ) after each filename if that file is a directory.
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-R Recursively list subdirectories encountered.
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