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

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Message-Id: <20190222235810.ae69b00c57442b5fb9dd01a8@kernel.org>
Date:   Fri, 22 Feb 2019 23:58:10 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Juerg Haefliger <juerg.haefliger@...onical.com>,
        Shuah Khan <shuah@...nel.org>
Cc:     linux-kernel@...r.kernel.org, rostedt@...dmis.org,
        mingo@...hat.com, Juerg Haefliger <juergh@...onical.com>
Subject: Re: [PATCH v2 1/2] selftests/ftrace: Replace echo -e with printf

On Fri, 22 Feb 2019 10:10:20 +0100
Juerg Haefliger <juerg.haefliger@...onical.com> 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.
> 
> Signed-off-by: Juerg Haefliger <juergh@...onical.com>

Looks good to me.

Acked-by: Masami Hiramatsu <mhiramat@...nel.org>

Thanks!

> ---
>  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
> -- 
> 2.19.1
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>