zless : Linux Command Manual

       zless [ name ...  ]

       Zless  is a filter which allows examination of compressed or plain text
       files one screenful at a time on  a  soft-copy  terminal.   It  is  the
       equivalent of setting the environment variable LESSOPEN to '|gzip -cdfq
       --   %s',   and   the    environment    variable    LESSMETACHARS    to
       "'<space><tab><newline>;*?"()<>[|&^`#\$%=~'",  and  then  running less.
       Less now provides similar, and more flexible, functionality through the
       lessfile and lesspipe filters.

       zmore, less, lessfile, lesspipe

       Zless  does not work with compressed data that is piped to it via stan-
       dard input; it requires that input files be specified as arguments.  If
       you  really  want to use less in a pipe, then do the uncompress explic-
       itly and pipe to less instead of using zless.

       Copyright (C) 2006 Free Software Foundation, Inc.
       Copyright (C) 1992, 1993 Jean-loup Gailly

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       entire resulting derived work is distributed under the terms of a  per-
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       Permission  is granted to copy and distribute translations of this man-
       ual into another language, under the above conditions for modified ver-
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       tion approved by the Foundation.