Search for SSH clients on the current system
A character vector specifying which types of SSH clients to search for. If NULL, a default set of clients supported by the current platform is searched for.
If TRUE, the first client found is returned, otherwise all located clients are returned.
If TRUE and no clients was found, then an error is produced, otherwise only a warning.
A named list of pathnames to all located SSH clients.
The pathnames may be followed by zero or more command-line options,
i.e. the elements of the returned list are character vectors of length
one or more.
first = TRUE, only the first one is returned.
version contains the output from querying the
executable for its version (via command-line option
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