Telnet command in action (click to enlarge)
Read full blog post: "Testing HTTP Status: 206 Partial Content and Range Requests"
Testing HTTP Status: 206 Partial Content and Range Requests
compgen: An Awesome Command To List All Linux Commands 
remark Command: Highlight Any Text or Command Output Using Regular Expressions
Linux Run Command As Another User 
pinfo: Read Linux Info Documentation in Colors
diff Command: Colorize Output On The Unix / Linux Command Line
Linux ifdata Command: See Network Interface Info Without Parsing ifconfig Outputls* Commands Are Even More Useful Than You May Have Thought
Linux / Unix pv Command: Monitor Progress of Data Sent Via a Pipe
Solaris / Linux: nicstat Command Show Network Interface Card Statistics 