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"&> /dev/null" works as a redirection from stdout/stderr to /dev/null in Bash but not in POSIX shell (considered as an asynchronous execution and the result of the "command" command cannot be retrieved). As a result, it always assumes that Docker always exists. This commit makes the redirection robust and portable (makes it possible to detect "no Docker" condition correctly). Signed-off-by: Tsukasa OI <research_trasio@irq.a4lg.com>
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