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selftests/ftrace: Use printf for backslash included command
Since the built-in echo has different behavior in POSIX shell (dash) and bash, kprobe_syntax_errors.tc can fail on dash which interpret backslash escape automatically. To fix this issue, we explicitly use printf "%s" (not interpret backslash escapes) if the command string can include backslash. Reported-by: Liu Yiding <[email protected]> Suggested-by: Xiao Yang <[email protected]> Signed-off-by: Masami Hiramatsu <[email protected]> Signed-off-by: Shuah Khan <[email protected]>
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