Android Screen Capture Using ADB
Objective: Take a screenshot of an Android device display using adb shell.
Decode PEM Encoded SSL Certificate
Objective: Decode a PAM encoded SSL certificate and verify that it contains the correct information.
Unix / Linux: Redirect of stderr Not Working
Explains stderr redirection pitfalls and common errors. For redirections to work, order is important and they are evaluated from left to right.
How to Verify If Email Address Exists
Objective: Verify if an email address is valid.
Unix / Linux: Create Binary File from Hex Dump
Objective: Create or convert a text hex dump input file to a binary file on Unix / Linux.
Unix / Linux: Display Running Clock in Terminal
Objective: On a Unix or Linux, display a running clock on the top right hand corner of a shell terminal.
Unix / Linux: Create File of Certain Size
Objective: Create a new file on Unix / Linux which is of certain size.
Check If Server Supports SPDY / HTTP/2
Objective: Check if a server supports SPDY and/or HTTP/2 protocols.
Unix / Linux: Grep on One Column
Objective: Perform grep on one single column and if there’s a match, print the whole line.
Unix / Linux: Use Netcat to Check If Port Is Open
Objective: Use netcat (often abbreviated to nc) to check if a remote TCP or UDP port is open.
