dir <- tempdir()
exist_prefix <- c("a", "b", "c")
exist_ext <- c("txt")
exist_file_combn_list <- cmd_file_combn(exist_prefix, exist_ext, dir) %T>%
purrr::walk(file.create)
bad_file <- tempfile()
exist_file_vector <- unlist(exist_file_combn_list)
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