Control Structures

• if/then/elif/else/fi

  • if [ $UID != 0 ]
  • then
    • echo "you are not root"
    • logger -p security.alert "$USER is running $0 at `date`"
  • elif [$HOME != /root ]
  • then
    • echo 'home directory is wrong"
  • else
    • # do something
  • fi

• while/do/done

  • while true
  • do
    • #something
  • done

Notes: