```sh
keys = map_keys handle
```
Returns a handle to an array holding all keys in the provided map handle.
### Parameters
* The map handle.
### Return Value
A handle to an array holding all map keys.
### Examples
```sh
handle = map
result = map_put ${handle} key1 value1
assert_eq ${result} true
result = map_put ${handle} key2 value2
assert_eq ${result} true
keys = map_keys ${handle}
for key in ${keys}
value = map_get ${handle} ${key}
echo Key: ${key} Value: ${value}
end
release ${handle}
release ${keys}
```