

check domain is register by others
whois google.com | grep Exp
if you get this message means this domain had been registered.
Registry Expiry Date: 2028-09-14T04:00:00Z
Registrar Registration Expiration Date: 2028-09-13T07:00:00+0000
grep
grep searches for PATTERNS in each FILE. PATTERNS is one or more patterns separated by newline characters, and grep prints each line that matches a pattern. Typically PATTERNS should be quoted when grep is used in a shell command.A FILE of ``-'' stands for standard input. If no FILE is given, recursive searches examine the working directory, and nonrecursive searches read standard input.
In addition, the variant programs egrep, fgrep and rgrep are the same as grep -E, grep -F, and grep -r, respectively. These variants are deprecated, but are provided for backward compatibility.
whois
whois searches for an object in a RFC 3912 database.This version of the whois client tries to guess the right server to ask for the specified object. If no guess can be made it will connect to whois.networksolutions.com for NIC handles or whois.arin.net for IPv4 addresses and network names.
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