ack questions

ack answers

• How to call getopts in bash multiple times
• Android source code compile error: "Try increasing heap size with java option '-Xmx<size>'"
• How to get a list of all blobs in a repository in Git
• How to print all the defined variables in emacs?
• Bash set -x echo redirects as well as commands
• Longest common prefix of two strings in bash
• REPL for Emacs Lisp