clarify $ escaping in Exec* lines

Explain that literal $ can be passed by doubling it.

diff --git a/man/systemd.service.xml b/man/systemd.service.xml
index 8eda85f62db6546684545c5a2082b5cdccd5781d..c06e14efc23e1c64b30515cc78de8a612c44b83d 100644 (file)
--- a/man/systemd.service.xml
+++ b/man/systemd.service.xml
@@ -369,7 +369,8 @@
                                 case it will be replaced by the value
                                 of the environment variable split up
                                 at whitespace, resulting in zero or
-                                more arguments. Note that the first
+                                more arguments. To pass literal dollar sign
+                                use <literal>$$</literal>. Note that the first
                                 argument (i.e. the program to execute)
                                 may not be a variable, since it must
                                 be a literal and absolute path