linux-kernel - RE: [PATCH v2] selftests/ftrace: Use printf for backslash included command

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Message-ID: <f61eda03333941958d62f9df93ba534b@AcuMS.aculab.com>
Date:   Mon, 11 May 2020 14:59:20 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Masami Hiramatsu' <mhiramat@...nel.org>
CC:     Shuah Khan <shuah@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Li Philip <philip.li@...el.com>,
        Liu Yiding <yidingx.liu@...el.com>,
        Xiao Yang <yangx.jy@...fujitsu.com>,
        Andreas Schwab <schwab@...ux-m68k.org>
Subject: RE: [PATCH v2] selftests/ftrace: Use printf for backslash included
 command

> > +    pos=$(printf "%s" "${2%^*}" | wc -c) # error position
> > +    command=$(printf "%s" "$2" | tr -d ^)

You may want to put all the $(...) inside "" to avoid field splitting
(not relevant to a shell assignment with modern shells) and
filename globbing.

> >      echo "Test command: $command"
> >      echo > error_log
> > -    (! echo "$command" >> "$3" ) 2> /dev/null
> > +    (! printf "%s" "$command" >> "$3" ) 2> /dev/null

WTF is the (! for ??
The (...) is a subshell.
And ! inverts the exit status.
Neither is needed at all.

	David

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