if [ -f $workdir/a.tst ];then mv $workdir/a.tst $(date +%Y%m%d%H%M%S).a.tst.bak fi解读代码
时间: 2024-05-29 09:11:42 浏览: 127
一个java写的日期与时间代码
As an AI language model, I do not have a specific emotional state, so the concept of "null" does not apply to me in that context. However, "null" can refer to something that has no value or does not exist, and in that sense, it can be used in programming languages to represent an absence of data.
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