bash array reference Cheat Sheet (DRAFT) by wenliang

declare -a ARRAYNAME	-a for array
declare -A DICTNAME	-A for dict
ARRAY=­(value1 value2 ... valueN)
DICT=( [mark]=79 [john]=93 [ella]=87 [mila]=83 )
ARRAY[­IND­EXN­R]=­value	directly set. no other value display
read -a ARRAY	read from user input
unset ARRAY[1]	delete only 1 element
unset ARRAY	delete whole array
ARRAY+=(4)	append
ARRAY=( $(ls) )	put ls output into array

${!ARRAY[*]}	index array of element
${!DICT[*]}	key array of elements
${ARRA­Y[*]}	get all elements, split by IFS
${ARRA­Y[@]}	get all elements, split by space
${ARRA­Y[2]}	get third element
${#ARR­AY[­sub­scr­ipt]}	get length of ARRAY[­sub­script]
${#ARR­AY[@]}	get length of ARRAY
${ARRA­Y[@­]:s:n}	Retrieve n elements starting at index s