Grep

• OR grab (to trigger on multiple terms):

  grep "target\|duration"

• Reversed grep (to exclude terms):

  cat /var/log/mail.log* | grep "auth failed" | grep -vE 'dropbox|blackprophecy|runes|linkedin|gpotato'

  -v reverses, -E enables reg.exp. syntax (to enable the | (pipe, i.e. 'or'), chracter).