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@RavagerAlpha
求教,这个怎么理解。

# [ -z `which app` ] 为0,则赋值MD5='openssl md5'?
[ -z `which openssl` ] || MD5='openssl md5'
求教,这个怎么理解。

# [ -z `which app` ] 为0,则赋值MD5='openssl md5'?
[ -z `which openssl` ] || MD5='openssl md5'
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