控制语句

if

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if condition 
then
  command1
  command2
  ...
elif condition2 
then
  command3
  command4
  ...
else
  command5
  command6
  ...
fi

for

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for var in list
do
  command1
  command2
  ...
done

while

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while condition
do
  command1
  command2
  ...
done

util

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until condition
do
  command1
  command2
  ...
done

break和continue

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while condition
do
  command1
  command2
  if condition2 
	then
    break
  fi
  command3
  ...
done
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while condition
do
  command1
  command2
  if condition2
  then
    continue
  fi
  command3
  ...
done