On Windows, to sever all network CIFS/SMB:

net use * /delete

On Linux using bash, the ultra useful repeat history:

history | grep whatever_you_want_to_recall

then bang-number from history, i.e.:

$ history | grep restart

  431  /etc/init.d/apache2 restart
  483  /etc/init.d/sshd restart
  501  history | grep restart

$ !431

Simple tricks that somehow I always forget. I don't know how, these should be akin to typing by this point.  Maybe by posting them I will remember.