It does give a warning, but then it overwrites the files, anyway. Reproducible example below.
This is R 3.4.3, but it does not seem to be fixed in R-devel: https://github.com/wch/r-source/blob/4a9ca3e5ac6b19d7faa7c9290374f7604bf0ef64/src/main/dounzip.c#L171-L174 FYI, Gábor dir.create(tmp <- tempfile()) setwd(tmp) cat("old1\n", file = "file1") cat("old2\n", file = "file2") utils::zip("files.zip", c("file1", "file2")) #> adding: file1 (stored 0%) #> adding: file2 (stored 0%) unlink("file2") cat("new1\n", file = "file1") readLines("file1") #> [1] "new1" utils::unzip("files.zip", overwrite = FALSE) #> Warning message: #> In utils::unzip("files.zip", overwrite = FALSE) : #> not overwriting file './file1 readLines("file1") #> [1] "old1" ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
