Index arrays in bash

1.sh

function search_array() {
    index=0
    while [ "$index" -lt "${#myArray[@]}" ]; do
        if [ "${myArray[$index]}" = "$1" ]; then
            echo $index
            return
        fi
        let "index++"
    done
    echo ""
}

myArray=(one two three)
value="one"

index=$(search_array $value)

if [ -z "$index" ]; then
    echo -e "the value \"$value\" is not in \$myArray"
else
    echo -e "the value \"$value\" was found at index: $index"
fi

2.sh

array=(one two three)
count=${#array[@]}
index=0
while [ "$index" -lt "$count" ]; do
    echo -e "index: $index\tvalue: ${array[$index]}"
    let "index++"
done

3.sh

#!/bin/sh

array[5]="tom"
array[13]="jenny"
array[77]="julie"

echo ${!array[*]} # find all the indexes

# print all indexes and associated values
for I in ${!array[*]}; do
  echo $I: ${array[$I]}
done