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IfStatements

Multi-line structure

if [ condition 1 ]; then

   action 1

elif [ condition 2 ]; then

   action 2

fi

Single line structure

if [ condition 1 ]; then action1 ; else action2 ; fi

Negative condition

if ! [ condition 1]; then

   action 2

else

   action 1

fi

See also some common Test Cases for examples of what to test.