gzip, gunzip, zcat-compresses or expands files

gzip , gunzip , zcat ”compresses or expands files

 gzip [ -acdfhlLnNrtvV19 ] [-S suffix] [ name ... ] gunzip [ -acfhlLnNrtvV ] [-S suffix] [ name ... ] zcat [ -fhLV ] [ name ... ] 

gzip reduces the size of the named files using Lempel-Ziv encoding (LZ77). Whenever possible, each file is replaced by one with the extension .GZ , while keeping the same ownership modes, access, and modification times.