How to use eval, hash, readonly, shift, getopts, set, unset, let and shopt - http://www.thegeekstuff.com/2010/08/bash-shell-builtin-commands

Sample bash completion

SSH_COMPLETE=( $(cut -f1 -d' ' ~/.ssh/known_hosts |\
                 tr ',' '\n' |\
                 sort -u |\
                 grep -e '[:alpha:]') )
complete -o default -W "${SSH_COMPLETE[*]}" ssh

http://kasparov.skife.org/blog/stuff/starting-a-meme.html

Check history statistic - brianm@binky:~$ history | awk {'print $2'} | sort | uniq -c | sort -k1 -rn | head
 164 svn
  52 cd
  42 ssh
  32 sudo
  22 git
  16 ls
  16 for
  14 echo
  13 man
  10 curl
brianm@binky:~$

http://bluebones.net/2008/04/history-meme/

easy way to do "[-h|--help][-n|--name <name>]" - http://binkley.blogspot.com/2016/03/bash-long-options.html