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echo "X:Y:Z:" | (IFS=": " read x y; echo "|$x|$y|")
echo "X:Y:Z" | (IFS=": " read x y; echo "|$x|$y|")
echo "X:Y:" | (IFS=": " read x y; echo "|$x|$y|")
echo "X:Y" | (IFS=": " read x y; echo "|$x|$y|")
echo "X:" | (IFS=": " read x y; echo "|$x|$y|")
echo "X" | (IFS=": " read x y; echo "|$x|$y|")
echo "" | (IFS=": " read x y; echo "|$x|$y|")
echo Whitespace should be trimmed too:
echo "X:Y : " | (IFS=": " read x y; echo "|$x|$y|")
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