Some things that I keep having to look up about the Z-shell.

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• Argument modification

  mod	result
  :h	remove last component of pathname
  :t	remove all leading components
  :r	remove extension
  :e	remove all but extension
  :u	uppercase first letter
  :l	lowercase first letter
  :s/l/r/	substitute l by r (& in r is replaced by l)
  :&	repeat last substitution
  :g	apply modifier once to each word
  :a	apply modifier as much as possible
  :p	print line but do not execute

• History substitution

  mod	result
  	Event selection
  !!	previous command
  !n	command number n
  !-n	nth previous command
  !str	most recent starting with str
  !?str[?]	most recent containing str
  !#	current command
  	Argument selection
  :0	first word (command)
  :n	nth argument
  [:]^	first argument
  [:]$	last argument
  [:]%	word matching str in most recent search
  :x-y	range of words
  [:]*	all arguments
  :x*	:x-$
  :x-	:x-$ but omitting last argument