http://manpages.ubuntu.com/manpages/trusty/man1/zgrep.1.html

NAME

       Zgrep - search compressed files for a regular expression

SYNOPSIS

       zgrep [options] <pattern> [files]

DESCRIPTION

       Zgrep is a front end to the grep program that allows transparent search       on any combination of compressed and non-compressed files. If any given       file  is  compressed, its uncompressed content is used. If a given file       does not exist, and its name  does  not  end  with  one  of  the  known       extensions,  zgrep tries the compressed file names corresponding to the       supported compressors. If no files are specified,  data  is  read  from       standard input, decompressed if needed, and fed to grep. Data read from       standard input must be of  the  same  type;  all  uncompressed  or  all       compressed  with  the  same  compressor.  The supported compressors are       bzip2, gzip, lzip and xz.       Exit status is 0 if match, 1 if no match, 2 if trouble.

OPTIONS

       --help display this help and exit       -V, --version              output version information and exit       -a, --text              treat all files as text       -A, --after-context=<n>              print <n> lines of trailing context       -b, --byte-offset              print the byte offset of each line       -B, --before-context=<n>              print <n> lines of leading context       -c, --count              only print a count of matching lines per file       -C, --context=<n>              print <n> lines of output context       -e, --regexp=<pattern>              use <pattern> as the pattern to match       -E, --extended-regexp              <pattern> is an extended regular expression       -f, --file=<file>              obtain patterns from <file>       -F, --fixed-strings              <pattern> is a set of newline-separated strings       -h, --no-filename              suppress the prefixing filename on output       -H, --with-filename              print the filename for each match       -i, --ignore-case              ignore case distinctions       -I     ignore binary files       -l, --files-with-matches              only print names of files containing matches       -L, --files-without-match              only print names of files containing no matches       -m, --max-count=<n>              stop after <n> matches       -n, --line-number              print the line number of each line       -o, --only-matching              show only the part of a line matching <pattern>       -q, --quiet              suppress all messages       -r, --recursive              operate recursively on directories       -s, --no-messages              suppress error messages       -v, --invert-match              select non-matching lines       --verbose              verbose mode (show error messages)       -w, --word-regexp              match only whole words       -x, --line-regexp              match only whole lines

zgrep用法