# Declare your array first (for context)
my_array=('string' 42 'anotherString' 100 'foo bar' 200)
# Prints the last 3 elements in a single line, space-separated
echo "${my_array[@]: -3}"
IyBEZWNsYXJlIHlvdXIgYXJyYXkgZmlyc3QgKGZvciBjb250ZXh0KQpteV9hcnJheT0oJ3N0cmluZycgNDIgJ2Fub3RoZXJTdHJpbmcnIDEwMCAnZm9vIGJhcicgMjAwKQoKIyBQcmludHMgdGhlIGxhc3QgMyBlbGVtZW50cyBpbiBhIHNpbmdsZSBsaW5lLCBzcGFjZS1zZXBhcmF0ZWQKZWNobyAiJHtteV9hcnJheVtAXTogLTN9Ig==