adig: add page (#8602)

pages/linux/adig.md

@@ -0,0 +1,24 @@
+# adig
+
+> Prints information received from Domain Name System (DNS) servers.
+> More information: <https://manned.org/adig>.
+
+- Display A (default) record from DNS for hostname(s):
+
+`adig {{example.com}}`
+
+- Display extra [d]ebugging output:
+
+`adig -d {{example.com}}`
+
+- Connect to [s]pecified DNS server:
+
+`adig -s {{1.2.3.4}} {{example.com}}`
+
+- Use specified TCP port to connect to DNS server:
+
+`adig -T {{port}} {{example.com}}`
+
+- Use specified UDP port to connect to DNS server:
+
+`adig -U {{port}} {{example.com}}`