This command will fail with non-zero status upon error. Some exit
codes are:
-. The config file is invalid (ret=3),
-. can not write to the config file (ret=4),
-. no section or name was provided (ret=2),
-. the section or key is invalid (ret=1),
-. you try to unset an option which does not exist (ret=5),
-. you try to unset/set an option for which multiple lines match (ret=5), or
-. you try to use an invalid regexp (ret=6).
+- The config file is invalid (ret=3),
+- can not write to the config file (ret=4),
+- no section or name was provided (ret=2),
+- the section or key is invalid (ret=1),
+- you try to unset an option which does not exist (ret=5),
+- you try to unset/set an option for which multiple lines match (ret=5), or
+- you try to use an invalid regexp (ret=6).
On success, the command returns the exit code 0.