配列名[要素] = val
配列名 = ( val1, val2, val3, ... )

#/bin/sh
array=( "test1" "test2" "test3" "test4" )

echo ${配列名[要素]}

#/bin/sh
array=( "test1" "test2" "test3" "test4" )
echo ${array[0]}

cnt=${#配列名[*]}

#/bin/sh
array=( "test1" "test2" "test3" "test4" )
cnt=${#array[*]}
echo cnt