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~ubuntu-branches/ubuntu/trusty/bash/trusty-security 

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# these didn't work in versions of bash before bash-4.0

LNAME=nordholz

echo ${LNAME[$(( 0 ))]//h/!}
echo ${LNAME[$(( 2 ))]//h/!}

echo ${LNAME[$(( 0 ))]##??}
echo ${LNAME[$(( 2 ))]##??}

echo ${LNAME[$(( 0 ))]:2}
echo ${LNAME[$(( 0 ))]:2:4}
echo ${LNAME[$(( 2 ))]:2}
echo ${LNAME[$(( 2 ))]:2:4}