Prince John Wesley questions

Prince John Wesley answers

• processing alternate line bash
• Replace a series of substrings by one copy
• sorting a file without using temporary files
• pipe one long line as multiple lines
• Regular Expression - Finding 4 digits in a string
• Incremental number in shell script on each loop
• how to hook up the moment when a Thread has been destroyed
• Cool class and method names wrapped in ``: class `This is a cool class` {}?
• Why does parseInt() return an unexpected result when I pass a string with a leading zero?
• Git; code disappeared after merge