diff --git a/bash.md b/bash.md
index 3a3b6159a..1da454aed 100644
--- a/bash.md
+++ b/bash.md
@@ -461,6 +461,7 @@ echo ${#Fruits[@]}          # Number of elements
 echo ${#Fruits}             # String length of the 1st element
 echo ${#Fruits[3]}          # String length of the Nth element
 echo ${Fruits[@]:3:2}       # Range (from position 3, length 2)
+echo ${!Fruits[@]}          # Keys of all elements, space-separated
 ```
 
 ### Operations