declare, local, typeset: add pages (#7529)

pages/common/declare.md

@@ -0,0 +1,28 @@
+# declare
+
+> Declare variables and give them attributes.
+> More information: <https://www.gnu.org/software/bash/manual/bash.html#Bash-Builtins>.
+
+- Declare a string variable with the specified value:
+
+`declare {{variable}}="{{value}}"`
+
+- Declare an integer variable with the specified value:
+
+`declare -i {{variable}}="{{value}}"`
+
+- Declare an array variable with the specified value:
+
+`declare {{variable}}=({{item_a item_b item_c}})`
+
+- Declare an associative array variable with the specified value:
+
+`declare -A {{variable}}=({{[key_a]=item_a [key_b]=item_b [key_c]=item_c}})`
+
+- Declare a readonly string variable with the specified value:
+
+`declare -r {{variable}}="{{value}}"`
+
+- Declare a global variable within a function with the specified value:
+
+`declare -g {{variable}}="{{value}}"`