linux-kernel - Re: [resend][PATCH 1/2] kprobetrace,doc: shell need single quote to use $ character

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Message-ID: <4B4EA4F3.6090401@redhat.com>
Date:	Thu, 14 Jan 2010 00:00:35 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [resend][PATCH 1/2] kprobetrace,doc: shell need single quote
 to use $ character

KOSAKI Motohiro wrote:
> shell interpret $val is as shell variable. thus we need quote if
> we use echo command.
> 
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Acked-by: Masami Hiramatsu <mhiramat@...hat.com>

Hi Ingo and KOSAKI-san,

Sorry, now this patch conflicts with my patch(commit 1464010) on the
latest -tip tree. The patch drops $argN support, so I updated the
1st example command.

Thank you,

> ---
>  Documentation/trace/kprobetrace.txt |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/trace/kprobetrace.txt b/Documentation/trace/kprobetrace.txt
> index 47aabee..2be6e19 100644
> --- a/Documentation/trace/kprobetrace.txt
> +++ b/Documentation/trace/kprobetrace.txt
> @@ -82,13 +82,13 @@ Usage examples
>  To add a probe as a new event, write a new definition to kprobe_events
>  as below.
>  
> -  echo p:myprobe do_sys_open dfd=$arg0 filename=$arg1 flags=$arg2 mode=$arg3 > /sys/kernel/debug/tracing/kprobe_events
> +  echo 'p:myprobe do_sys_open dfd=$arg0 filename=$arg1 flags=$arg2 mode=$arg3' > /sys/kernel/debug/tracing/kprobe_events
>  
>   This sets a kprobe on the top of do_sys_open() function with recording
>  1st to 4th arguments as "myprobe" event. As this example shows, users can
>  choose more familiar names for each arguments.
>  
> -  echo r:myretprobe do_sys_open $retval >> /sys/kernel/debug/tracing/kprobe_events
> +  echo 'r:myretprobe do_sys_open $retval' >> /sys/kernel/debug/tracing/kprobe_events
>  
>   This sets a kretprobe on the return point of do_sys_open() function with
>  recording return value as "myretprobe" event.

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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