Shell Script to Rotate Backup Files Every Few Days
2022-11-28 00:03 (2 years ago)
ytyng
Here is the English translation of the provided Japanese blog article:
If you need to rotate backup files (delete old files) every few days, you can use:
find backup-dir/ -mtime +10 | xargs rmor use logrotate to achieve this.
Recently, I realized that I can achieve this by sharding the sequential days that increase by one each day using % 10. So, I have been using the following method:
# The shard number changes daily. Rotates every 10 days.
date_shard=$(( ( $(date +%s) / 86400 ) % 10 ))
backup-command > backup-dir/backup.${date_shard}
echo $(date +"%F %T") Done. shard=${date_shard} >> backup-dir/log.txtIt can be implemented simply.
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