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📅  最后修改于: 2022-03-11 14:49:44.282000             🧑  作者: Mango
~$ sh co.sh 2017-01-05 ~$ sh co.sh 2017-01-04 2017-01-04 ~$ cat co.sh DAY=${1:-$(date +%F -d "yesterday")} echo $DAY