Sometimes, the sys command may be misused, but it doesn't display the expected help information, for example: Without the patch: crash> sys kmem NAME kmem - kernel memory SYNOPSIS kmem [-f|-F|-c|-C|-i|-v|-V|-n|-z|-o|-h] [-p | -m member[,member]] [[-s|-S|-S=cpu[s]|-r] [slab] [-I slab[,slab]]] [-g [flags]] [[-P] address]] ... crash> sys abc crash> With the patch: crash> sys kmem Usage: sys [-c [name|number]] [-t] [-i] config Enter "help sys" for details. crash> sys abc Usage: sys [-c [name|number]] [-t] [-i] config Enter "help sys" for details. Signed-off-by: Lianbo Jiang <lijiang(a)redhat.com&gt; --- kernel.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel.c b/kernel.c index 9c4aabffe580..1c6344735299 100644 --- a/kernel.c +++ b/kernel.c @@ -5476,7 +5476,7 @@ cmd_sys(void) else if (STREQ(args[optind], "config")) read_in_kernel_config(IKCFG_READ); else - cmd_usage(args[optind], COMPLETE_HELP); + cmd_usage(pc->curcmd, SYNOPSIS); optind++; } while (args[optind]); } -- 2.20.1