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add 'current time point for N days ago or after'

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PoplarYang 2022-05-16 00:33:16 +08:00
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@ -1145,6 +1145,21 @@ date --date @1615852800
```
##### Print current time point for N days ago or after N days
```bash
# get this time a day ago
date -d"1 day ago" +"%F %H:%M:%S"
# get this time tomorrow
date -d"-1 day ago" +"%F %H:%M:%S"
# get this time 7 days ago
date -d"1 week ago" +"%F %H:%M:%S"
# get this time a week ago
date -d"7 day ago" +"%F %H:%M:%S"
```
##### wait for random duration (e.g. sleep 1-5 second, like adding a jitter)
```bash
sleep $[ ( $RANDOM % 5 ) + 1 ]