unpack
unpack
extracts a tarball in the current working
directory or in a specified directory.
unpack
recognises the following file extensions:
tar, tar.gz, tgz, tar.bz2, tbz2, tar.Z.
unpack
is called automatically from fetch
(3)
(and thus sub
(3))
if the fetched package is a tarball. So you seldomly need to call it
explicitly from within your configuration script.