Changes in version 1.12:

zgrep now also accepts the following options: '-G, --basic-regexp',
'--label=<label>', '--line-buffered', '-P, --perl-regexp', '--silent',
'-T, --initial-tab', '-U, --binary', and '-Z, --null'.
(Reported by Chris Jamboretz and Leah Neukirchen).

zupdate now accepts option '-e, --expand-extensions', which makes it expand
combined file name extensions; tgz -> tar.lz.

zupdate now also accepts option '-i, --ignore-errors', which makes it ignore
non-fatal errors.

All utilities now support compress'd (.Z) files through gzip. For this to
work, the gzip program used (for example GNU gzip) must be able to
decompress .Z files.