bash shell 提供了两种一维数组,分别是 index array 和 associative array,常见的翻译是索引数组和关联数组。任何变量都可以用作数组,也就是说如果你使用了数组赋值的语法操作变量(name[subscript]=value),则变量默认会转换为索引数组。同时你也可以使用declare显示地定义数组。比如declare -a array。 index array 和 ...
To print the values of an associative array, use theechoorprintfcommand and reference all the array elements. For example: echo ${example_array[@]} The at symbol (@) accesses all array elements and prints only the values. To print the associative array keys, use the following: echo ${!
Associative arrays work based on key-value pairs. In some languages, it is also calleddictionariesorhash maps. The main difference between Indexed and Associative arrays is, Indexed arrays works based on index value, and each element in the array is mapped to a particular index position of the...
The method of printing all the keys and elements of an Associative array is mostly the same. To print all keys at once, use${!my_array[@]}which will retrieve all the keys in the associative array: echo "Keys: ${!my_array[@]}" If I want to print all the keys ofmyarray, then ...
Bash Associative Array (dictionaries, hash table, or key/value pair) When to use double quotes with Bash Arrays? Array Operations How to iterate over a Bash Array? (loop) How to get the Key/Value pair of a Bash Array? (Obtain Keys or Indices) How to get a Bash Array size? (Array ...
declare -A myAssociativeArray myAssociativeArray["fruit"]="Apple" myAssociativeArray["vegetable"]="Carrot" # Accessing elements echo ${myAssociativeArray["fruit"]} # Output: # 'Apple' In this example, we created an associative arraymyAssociativeArrayand added two elements with keys “fruit” ...
In this example, we declare an associative array with the-Aoption. We then use a ‘for’ loop to iterate over the keys of the array (obtained using the!symbol before the array variable). Further Resources for Bash Array Loop Mastery ...
#!/usr/bin/env bash\n\nset -u\n\n#declare -A map=(one ONE two TWO)\narray=(one ONE two TWO)\ndeclare -A map=("${array[@]}")\n# Workaround with `eval`:\n#eval "declare -A map=(${array[@]@Q})"\n\necho "KEYS:"\nprintf \' %s\\n\' "${!map[@]}"\necho "...
The above Bash script successfully prints the associative array “my_associative” (both the keys and values) using length expressions ${!my_associative[@]} and ${my_associative[@]} respectively. 2. Print an Array in Bash Using the “declare -p” Command The declare -p command in Bash di...
If you want to print out all the array keys, you can use the@and!symbols as demonstrated below: echo${!animal[@]} To find the number of elements the associative array has, use the same syntax you'd use with indexed arrays (demonstrated in the last section). ...