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if [shell]

if command
then
  commands
fi

if command
then
  commands
else
  commands
fi

if command
then
  commands
elif command
then
  commands
else
  commands
fi
An example: 
if [ `expr 2 + 3` -eq 7 ]
then
  echo "1"
elif [ `expr 2 + 3` -eq 4 ] 
then
  echo "2"
else 
  echo "3"
fi