Check if a file is a gzip file

Source: R/gziputils.r

Check if a file is a gzip file

is.gzip(f)

Arguments

f

Path to file to test

Value

logical indicating whether f is in gzip format (or NA if the file cannot be accessed)

Examples

notgzipfile=tempfile()
writeLines('not a gzip', notgzipfile)
is.gzip(notgzipfile)
#> [1] FALSE
con=gzfile(gzipfile<-tempfile(),open='wt')
writeLines('This one is gzipped', con)
close(con)
is.gzip(gzipfile)
#> [1] TRUE
unlink(c(notgzipfile,gzipfile))