select: add page (#10578)

pages/linux/select.md

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+# select
+
+> Bash builtin construct for creating menus.
+> More information: <https://www.gnu.org/software/bash/manual/bash.html#index-select>.
+
+- Create a menu out of individual words:
+
+`select {{word}} in {{apple}} {{orange}} {{pear}} {{banana}}; do echo ${{word}}; done`
+
+- Create a menu for picking a file or folder from the current directory:
+
+`select {{file}} in *; do echo ${{file}}; done`
+
+- Create a menu from a Bash array:
+
+`{{fruits}}=({{apple}} {{orange}} {{pear}} {{banana}}); select {{word}} in ${{{fruits}}[@]}; do echo ${{word}}; done`