~: add page (#13904)

pages/common/~.md

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+# Tilde
+
+> Expand to a directory.
+> More information: <https://gnu.org/software/bash/manual/bash.html#Tilde-Expansion>.
+
+- List the current user's home directory contents:
+
+`ls ~`
+
+- List the home directory contents of another user:
+
+`ls ~{{username}}`
+
+- List the contents of the previous directory you were in:
+
+`ls ~-`