The "--keep" (-k) option was added to not delete input files, in line with other tools such as xz, lzip, and bzip2. A decompression issue with certain invalid data in the 'pack' format was fixed. An incorrect overwrite when compiled with optimization was fixed. zgrep's handling of multi-digit context options was fixed. zmore now acts more like 'more'.
Changelog:
* Noteworthy changes in release 1.5 (2012-06-17) [stable]
** Bug fixes
gzip -d now decodes and checks header CRC16 checksums as specified by
the FHCRC section of Internet RFC 1952.
"gzip -d -S '' precious.gz" is now rejected immediately. Before,
that command would emulate "rm -i precious.gz", but with an easily-
misunderstood prompt. I.e., gzip would ask if it's ok to remove the
existing file, "precious.gz". If you made the mistake of saying "yes",
it would remove that input file before attempting to uncompress it.
gzip -cdf now properly handles input consisting of gzip'd data followed
by uncompressed data. Before it would output raw compressed input, too.
For example, now "(printf x|gzip; echo y)|gzip -dcf" prints "xy\n",
while before it would print "x<compressed data>y\n".
gzip -rf no longer compresses files more than once (e.g., replacing
FOO with FOO.gz.gz) on file systems such as ZFS where a readdir
loop that unlinks and creates files can revisit output files.
