Loops

• while condition-list
  do
  list
  done

• until condition-list
  do
  list
  done

• for name in word1 word2 ...
  do
  list
  done

• for (( init; test;; update ))
  do
  list
  done

• The while, until, for, do and done must start a line
  or follow a semicolon.

• You can omit the in and word list to get a for loop to process positional parameters.