[PATCH] sefltests/ftrace: Use /bin/echo for output with options

[Masami Hiramatsu]

Use /bin/echo for console output with options like non
newline (-n) and/or backslash escape (-e).

Tom Zanussi reported that when he tested ftracetest, it
shows "-e" and "-n" options on the console, since a system
which uses dash as the alias of /bin/sh, uses dash built-in
echo command which doesn't accept "-e".

To avoid this issue, use /bin/echo instead of echo for
the output with options.

Fixes: 8f381ac4d321 ("selftests/ftrace: Add color to the PASS / FAIL results")
Link: http://lkml.kernel.org/r/cover.1542221862.git.tom.zanussi@xxxxxxxxxxxxxxx
Reported-by: Tom Zanussi <zanussi@xxxxxxxxxx>
Suggested-by: Tom Zanussi <zanussi@xxxxxxxxxx>
Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
---
 tools/testing/selftests/ftrace/ftracetest |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
index 75244db70331..ba670b452bdb 100755
--- a/tools/testing/selftests/ftrace/ftracetest
+++ b/tools/testing/selftests/ftrace/ftracetest
@@ -173,8 +173,8 @@ strip_esc() {
 }
 
 prlog() { # messages
-  echo -e "$@"
-  [ "$LOG_FILE" ] && echo -e "$@" | strip_esc >> $LOG_FILE
+  /bin/echo -e "$@"
+  [ "$LOG_FILE" ] && /bin/echo -e "$@" | strip_esc >> $LOG_FILE
 }
 catlog() { #file
   cat $1