bash-completion: journalctl: use --output=help to show suggestions

diff --git a/shell-completion/bash/journalctl b/shell-completion/bash/journalctl
index f96228f..bcd4533 100644 (file)
--- a/shell-completion/bash/journalctl
+++ b/shell-completion/bash/journalctl
@@ -66,7 +66,7 @@ _journalctl() {
                                 compopt -o filenames
                         ;;
                         --output|-o)
-                                comps='short short-full short-iso short-iso-precise short-precise short-monotonic short-unix verbose export json json-pretty json-sse json-seq cat with-unit'
+                                comps=$( journalctl --output=help 2>/dev/null )
                         ;;
                         --field|-F)
                                 comps=$(journalctl --fields | sort 2>/dev/null)