mantaLs.paths: Lists, searches, filters, sorts and formats Manta directory...
In joyent/mantaRSDK: Joyent Manta Storage Service R Software Development Kit

Searches for filenames with regular expressions (using R grep). Sorts listings by filename, time, or size. Use this dotted form of mantaLs for passing mantapath parameters into vectorized functions like mantaJob.launch, mantaGet, mantaSnapln, etc.

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mantaLs.paths(mantapath, grepfor, json, items = "a", sortby = "none",
  decreasing = FALSE, ignore.case = FALSE, perl = FALSE,
  verbose = FALSE)

`mantapath`	character, optional. Current subdirectory set by `mantaSetwd` is used, otherwise specify full Manta path to subdirectory. Supports `~~` expansion to your Manta username, e.g. `"~~/public"` and UTF-8 encoded characters.
`grepfor`	character optional. Regular expression for `grep` name search. Uses R regexps, N.B. use `"[.]txt"`, not `"*.txt"` to match filename extensions.
`json`	optional. Input saved JSON data from `mantaLs(format='json')` used for reprocessing previously retrieved listings. Include previously specified mantapath if you wish to recover true paths.
`items`	character optional. `'a'` for all, `'d'` for directory, `'o'` for object.
`sortby`	character, optional. Specify `'none'`, `'name'`, `'time'`, or `'size'`.
`decreasing`	logical, optional. Argument passed to R `order` for sorting.
`ignore.case`	logical, optional. Argument passed to R `grep` for searching.
`perl`	logical, optional. Argument passed to R `grep` for searching.
`verbose`	logical, optional. Verbose HTTPS `RCurl` data output on Unix.