Commands: 	(identifiers are shown in uppercase, [] means optional)
NAME		- print info about the host/domain NAME using default server
NAME1 NAME2	- as above, but use NAME2 as server
help or ?	- print info on common commands; see nslookup(1) for details
set OPTION	- set an option
    all		- print options, current server and host
    [no]debug	- print debugging information
    [no]d2	- print exhaustive debugging information
    [no]defname	- append domain name to each query 
    [no]recurse	- ask for recursive answer to query
    [no]vc	- always use a virtual circuit
    domain=NAME	- set default domain name to NAME
    srchlist=N1[/N2/.../N6] - set domain to N1 and search list to N1,N2, etc.
    root=NAME	- set root server to NAME
    retry=X	- set number of retries to X
    timeout=X	- set initial time-out interval to X seconds
    querytype=X	- set query type, e.g., A,ANY,CNAME,HINFO,MX,NS,PTR,SOA,WKS
    type=X	- synonym for querytype
    class=X	- set query class to one of IN (Internet), CHAOS, HESIOD or ANY
server NAME	- set default server to NAME, using current default server
lserver NAME	- set default server to NAME, using initial server
finger [USER]	- finger the optional NAME at the current default host
root		- set current default server to the root
ls [opt] DOMAIN [> FILE] - list addresses in DOMAIN (optional: output to FILE)
    -a 		-  list canonical names and aliases
    -h 		-  list HINFO (CPU type and operating system)
    -s 		-  list well-known services
    -d 		-  list all records
    -t TYPE 	-  list records of the given type (e.g., A,CNAME,MX, etc.)
view FILE	- sort an 'ls' output file and view it with pg
exit		- exit the program, EOF (e.g. ^D) also exits