Check if a file is a gzip file

Description

Check if a file is a gzip file

Usage

1

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

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notgzipfile=tempfile()
writeLines('not a gzip', notgzipfile)
is.gzip(notgzipfile)
con=gzfile(gzipfile<-tempfile(),open='wt')
writeLines('This one is gzipped', con)
close(con)
is.gzip(gzipfile)
unlink(c(notgzipfile,gzipfile))

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