Add entry on disown vs nohup

SC2039.md

@@ -267,6 +267,24 @@ trap my_handler TERM
 trap my_handler 15
 ```
 
+### disown
+
+Bash:
+
+```Bash
+<command>
+disown %<command>
+```
+
+POSIX:
+
+```sh
+nohup <command>
+```
+
+Note that while `nohup` can be used to achieve the same result, their semantics is different.
+Also note that `nohup` will, by default, redirect input and output.
+
 ## Exception
 
 Depends on what your expected POSIX shell providers would use.