as.character.file | Convert file connections to strings |
is_connection | Is the input a connection? |
is_dir | Is the path a directory? Checks to see if the input path is a... |
is_empty_file | Is a file too big or small? |
is_executable_file | Is the file accessible? |
is_existing_file | Does the file exist? |
is_library | Is the directory a known R library? |
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