}
##
-## If the argument is the name of a vserver selected use by the current helper,
+## If all the arguments are existing vservers names, returns 0.
+## Else, returns 1. Also returns 1 if no argument is given.
+##
+vservers_exist() {
+ [ $# -ge 1 ] || return 1
+ local args="$1"
+ local vserver i found
+ for vserver in $args ; do
+ found=no
+ for i in $found_vservers ; do
+ if [ $vserver = $i ]; then
+ found=yes
+ break
+ fi
+ done
+ [ $found = yes ] || return 1
+ done
+ return 0
+}
+
+##
+## If the argument is the name of a vserver selected by the current helper,
## echoes 'on' and returns 0.
## Else, echoes 'off' and returns 1.
##