compsys: Ignoring matches

zstyle ':completion:*:(all-|)files' ignored-patterns '(|*/)CVS'
zstyle ':completion:*:cd:*' ignored-patterns '(*/)#CVS'

zstyle ':completion:*:cd:*' ignored-patterns '(*/)#lost+found'

zstyle ':completion:*:*:*:users' ignored-patterns \
    adm apache bin daemon games gdm halt ident junkbust lp mail mailnull \
    named news nfsnobody nobody nscd ntp operator pcap postgres radvd \
    rpc rpcuser rpm shutdown squid sshd sync uucp vcsa xfs backup  bind  \
    dictd  gnats  identd  irc  man  messagebus  postfix  proxy  sys  www-data

zstyle ':completion:*:functions' ignored-patterns '_*'

Useful for cd, mv and cp. Ex, cd will never select the parent directory (ie cd ../<TAB>):

zstyle ':completion:*:(cd|mv|cp):*' ignore-parents parent pwd

With commands like `rm/kill/diff' it's annoying if one gets offered the same filename again even if it is already on the command line. To avoid that:

zstyle ':completion:*:(rm|kill|diff):*' ignore-line yes