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Bash allows for variables to expand only if non-empty: $ var=test $ echo ${var:+"$var"} test $ echo ${var:+"-k $var"} -k test $ var= $ echo ${var:+"-k $var"} Use this feature to avoid the workaround. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Tom Rini <trini@konsulko.com>
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