If you run a command and get a “command not found” error, you can do 2 things; specify the full path to the file and check to see if the package is installed.
$ nslookup www.google.com
bash: nslookup: command not found
$ /usr/bin/nslookup
-bash: /usr/bin/nslookup: No such file or directory
This means it isn’t installed. If you’re using yum, you can use this command:
yum provides “*/nslookup”
or
yum provides /usr/bin/nslookup
Then yum install
In this case, yum provides “*/nslookup” returns this:
30:bind-utils-9.3.6-4.P1.el5_5.3.i386 : Utilities for querying DNS name servers.
Repo : updates
Matched from:
Filename : /usr/bin/nslookup
So then you need to install it.
yum install bind-utils
# nslookup google.com
Server: 192.168.1.154
Address: 192.168.1.154#53
Non-authoritative answer:
Name: google.com
Address: 74.125.224.84
Name: google.com
Address: 74.125.224.80
Name: google.com
Address: 74.125.224.81
Name: google.com
Address: 74.125.224.82
Name: google.com
Address: 74.125.224.83
