[Errno 14] Could not open/read file:///etc/pki/rpm-gpg

fix:

cd /etc/pki/rpm-gpg/
wget http://www.crc.id.au/repo/RPM-GPG-KEY-kernel-xen

Change time zone on Linux

# ln -sf /usr/share/zoneinfo/Asia/Ho_Chi_Minh /etc/localtime
type date to confirm that date changed
NSN

Send mail via telnet

1. Telnet to hostname on port 25
2. HELO your_domain_name or whatever
3. MAIL FROM:[email protected] (ie, your email address)
4. RCPT TO:them@someplace_else.com (email address you want to send to)
5. DATA
6. You type your message then CRLF period CRLF (ie, type a period on a line by itself then hit ENTER)
7. QUIT
NSN