Description:

Zutils is a collection of utilities able to deal with any combination
of compressed and non-compressed files transparently. If any given file,
including standard input, is compressed, its decompressed content is used.
Compressed files are decompressed on the fly; no temporary files are created.
These utilities are not wrapper scripts but safer and more efficient C++
programs. In particular the "--recursive" option is very efficient in those
utilities supporting it.

The provided utilities are:
Zcat - Decompresses and copies files to standard output.
Zcmp - Decompresses and compares two files byte by byte.
Zdiff - Decompresses and compares two files line by line.
Zgrep - Decompresses and searches files for a regular expression.
Ztest - Tests integrity of compressed files.

The supported compressors are bzip2, gzip, lzip and xz.