Create do.md

pages/common/do.md

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+# do
+
+> This shell keyword is used with `for`, `while`, `select`, and `until` to mark the start of a loop.
+
+- View documentation for the `while` keyword:
+
+`tldr while`
+
+- View documentation for the `while` keyword:
+
+`tldr for`
+
+- View documentation for the `while` keyword:
+
+`tldr select`
+
+- View documentation for the `while` keyword:
+
+`tldr until`