Peder Klingenberg questions

Peder Klingenberg answers

• How do I cd into a directory using perl?
• In lisp, how do I use the second value that the floor function returns?
• SSH: When logging in, is the password in plain text / sniffable? [closed]
• What is a reason for using shift $((OPTIND-1)) after getopts?
• How do I delete an exported environment variable?
• Non-blocking input in lisp