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jesperronn/isDefined.sh

Created February 26, 2013 19:11
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isDefined() unix method to determined if a variable exists
Raw
isDefined.sh
function isDefined() {
varname=$1;
declare -p $varname >/dev/null 2>&1;
if [ "$?" -eq 0 ]; then
echo Defined;
fi;
}
http://nixcraft.com/shell-scripting/15375-testing-bash-variable-existence.html
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