Linux Fundamentals 
...om one host to another using scp
Generate and use
RSA and
DSA user keys
Use ssh-agent to cache the decrypted private key
Section 15 -
Managing Software
Downloading
Software FTP,
NcFTP, and lftp wget, lynx, and links Installing Software Installing Binary Packages - rpm Querying and Verifying with rpm Installing Debian Packages Compiling / Installing from Source Installing Source RPM
more...