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The bash shell lets you put multiple commands on one line if they are each separated by a semicolon ( ; ). So in the above for loop, you can see that bash consideres considers the do keyword to start a separate command. Two alternate ways of writing the loop are:

# One line for each clause, no semicolons
for <variable name> in <expression>
do 
  <something>
  <something else>
done

# All on one line, with semicolons separating clauses
for <variable name> in <expression>; do <something>; <something else>; done