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+# <>
+
+> Open a file descriptor for read and write.
+> More information: <https://www.gnu.org/software/bash/manual/bash.html#Opening-File-Descriptors-for-Reading-and-Writing>.
+
+- Open a file in a file descriptor for read an write:
+
+`exec {{3}}<>{{path/to/file}}`
+
+- Open a file descriptor to a remote connection:
+
+`exec {{3}}<>/dev/{{tcp}}/{{remote_host}}/{{port_number}}`
+
+- Close a file descriptor:
+
+`exec {{3}}<>-`