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

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Message-Id: <20190222091021.10178-2-juergh@canonical.com>
Date:   Fri, 22 Feb 2019 10:10:20 +0100
From:   Juerg Haefliger <juerg.haefliger@...onical.com>
To:     linux-kernel@...r.kernel.org, rostedt@...dmis.org,
        mingo@...hat.com, mhiramat@...nel.org
Cc:     Juerg Haefliger <juergh@...onical.com>
Subject: [PATCH v2 1/2] selftests/ftrace: Replace echo -e with printf

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>
---
 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