Bug boo#940837
Bug bsc#959299

That is do not escape the dollar character of a variable to allow
commands like `ls' to go further in its completion chain.

---
 bash_completion |   15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

--- bash_completion
+++ bash_completion	2017-07-04 07:47:32.437889150 +0000
@@ -1886,8 +1886,19 @@ _complete_as_root()
 
 _longopt()
 {
-    local cur prev words cword split
-    _init_completion -s || return
+    local cur=${COMP_WORDS[COMP_CWORD]}
+    local prev words cword split
+
+    if [[ "${cur:0:1}" == '$' ]] ; then
+        compopt -o dirnames +o filenames
+    else
+        compopt +o dirnames -o filenames
+    fi
+
+    if ! _init_completion -s ; then
+        _dollar $cur
+        return
+    fi
 
     case "${prev,,}" in
         --help|--usage|--version)