Posix

sh
https://sites.google.com/site/jdisnard/path-dupes remove duplicate paths. http://unix.stackexchange.com/questions/40749/remove-duplicate-path-entries-with-awk-command


 * http://www.tldp.org/LDP/abs/abs-guide.pdf 900 page guide
 * http://sourcemage.org/Sorcery/Book shell style guide, a clone of Linuxfromscratch.com

links

 * LinuxNotes, ShellCommands Mesh networking shell commands