amass, httprobe, sublist3r, theHarvester: add page (#4912)

pages/common/amass-db.md

@@ -0,0 +1,20 @@
+# amass db
+
+> Interact with an Amass database.
+> More information: <https://github.com/OWASP/Amass/blob/master/doc/user_guide.md#the-db-subcommand>.
+
+- List all performed enumerations in the database:
+
+`amass db -dir {{path/to/database_directory}} -list`
+
+- Show results for a specified enumeration index and domain name:
+
+`amass db -dir {{path/to/database_directory}} -d {{domain_name}} -enum {{index_from_list}} -show`
+
+- List all found subdomains of a domain within an enumeration:
+
+`amass db -dir {{path/to/database_directory}} -d {{domain_name}} -enum {{index_from_list}} -names`
+
+- Show a summary of the found subdomains within an enumeration:
+
+`amass db -dir {{path/to/database_directory}} -d {{domain_name}} -enum {{index_from_list}} -summary`