anacron
Table of Contents
anacron is a program to schedule periodic task. Anacron assume your computer to not be running 24*7, and use timestamp to record last executed time of jobs. unlike cron, anacron will execute missed jobs.
1. Run user-level anacron
- Create a
~/etc/anacrontaband~/var/spool/anacronto store jobs and timestamps. - Then, put
anacron -t ${HOME}/etc/anacrontab -S ${HOME}/var/spool/anacronin your~/.bashrsor yourcrontab -e(which let you edit your user crontab), so that anacron is run at login time and/or every hour(as specified in your crontab)
cp /etc/anacrontab for template.
Backlinks
Here is a script using cron, anacron and rsync to backup my important files
0 * * * * linfeng anacron -t ${HOME}/etc/anacrontab -S ${HOME}/var/spool/anacron
SHELL=/bin/sh PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin 1 0 /usr/bin/rsync -aAX --delete --exclude '*.Trash-1000' /home/linfeng/Dropbox/Notes/ /media/linfeng/backup/Notes/daily 7 10 /usr/bin/rsync -aAX --delete --exclude '*.Trash-1000' /home/linfeng/Dropbox/Notes/ /media/linfeng/backup/Notes/weekly @monthly 15 /usr/bin/rsync -aAX --delete --exclude '*.Trash-1000' /home/linfeng/Dropbox/Notes/ /media/linfeng/backup/Notes/monthly_$(date +%Y%m%d)