zless(1) -- Linux man page
NAMEzless - file perusal filter for crt viewing of compressed text
SYNOPSISzless [ name ... ]
DESCRIPTIONZless 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 PAGER to less, and then running zmore. However, enough people seem to think that having the command zless available is important to be worth providing it.
SEE ALSOzmore(1), less(1)