make full_usage aware of possible PBC setting in config

pbc

@@ -38,8 +38,6 @@ function full_usage() {
   echo "Commands of proxmox-backup-client:"
   echo
   "$PBC" help | tail -n +3
-  echo
-  return $?
 }
 
 function pbc-version() {
@@ -205,6 +203,8 @@ PBC=$(command -v proxmox-backup-client)
 PBC_DOWNLOAD_URL='http://download.proxmox.com/debian/pbs-client/dists/trixie/main/binary-amd64'
 ETC_DIR="/etc/$SCRIPT"
 
+FULL_HELP=false
+
 action=''
 cfgfile="$ETC_DIR/config"
 args=()
@@ -224,8 +224,7 @@ while [ -n "$1" ]; do
         exit 0
       ;;
       -H|--full-help)
-        full_usage
-        exit 0
+        FULL_HELP=true
       ;;
       -*)
         echo "Error: invalid option: $opt" >&2
@@ -261,6 +260,13 @@ while [ -n "$1" ]; do
 done
 
 
+if $FULL_HELP; then
+  [ -f "$cfgfile" ] && source "$cfgfile"
+  PBC=${PBC:-/usr/local/bin/proxmox-backup-client}
+  full_usage
+  exit $?
+fi
+
 if [ "$action" == 'install' ]; then
   if [ -f "$cfgfile" ]; then
     source "$cfgfile" || exit $?