linux-kernel - Re: [RESEND PATCH v2 1/2] selftests/ftrace: Replace echo -e with printf

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Date:   Fri, 22 Feb 2019 15:33:50 -0700
From:   shuah <shuah@...nel.org>
To:     Juerg Haefliger <juerg.haefliger@...onical.com>,
        linux-kernel@...r.kernel.org, rostedt@...dmis.org,
        mingo@...hat.com, mhiramat@...nel.org,
        linux-kselftest@...r.kernel.org
Cc:     Juerg Haefliger <juergh@...onical.com>, shuah <shuah@...nel.org>
Subject: Re: [RESEND PATCH v2 1/2] selftests/ftrace: Replace echo -e with
 printf

On 2/22/19 1:53 PM, Juerg Haefliger wrote:
> echo -e is not POSIX. Depending on what /bin/sh is, we can get
> incorrect output like:
> $ -e -n [1] Basic trace file check
> $ -e 	[PASS]
> 
> Fix that by using printf instead.
> 
> Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
> Signed-off-by: Juerg Haefliger <juergh@...onical.com>
> ---
>   tools/testing/selftests/ftrace/ftracetest | 9 +++++++--
>   1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
> index fc755e1b50f1..20c9c0ad8682 100755
> --- a/tools/testing/selftests/ftrace/ftracetest
> +++ b/tools/testing/selftests/ftrace/ftracetest
> @@ -173,8 +173,13 @@ strip_esc() {
>   }
>   
>   prlog() { # messages
> -  echo -e "$@"
> -  [ "$LOG_FILE" ] && echo -e "$@" | strip_esc >> $LOG_FILE
> +  newline="\n"
> +  if [ "$1" = "-n" ] ; then
> +    newline=
> +    shift
> +  fi
> +  printf "$*$newline"
> +  [ "$LOG_FILE" ] && printf "$*$newline" | strip_esc >> $LOG_FILE
>   }
>   catlog() { #file
>     cat $1
> 

This patch applied to linux-kselftest next which is at 5.0rc6
I queued this for 5.1-rc1.

thanks,
-- Shuah