Rsync and find trickery

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sudo crontab -l
# executed using sh
# m h  dom mon dow   command
30 2 * * 1,2,3,4,5,6 /root/tools/backup_all.sh
00 1 * * 1 /root/tools/samba_archive.sh
# delete surveillance older than a month
15 2 * * 1,2,3,4,5,6 /usr/bin/find /media/video/ -iname '*.mp4' -mtime +30 -exec rm {} \;
10 2 * * 1,2,3,4,5,6 /usr/bin/find /srv/sambashared/ -iname '*considered*harmful*.exe' -delete
# move samba grade folder contents to next year
0 4 30 8 * /root/tools/move_sambashared.sh

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sudo cat /root/tools/move_sambashared.sh
#!/bin/sh
# Move sambashared files and directories to the next year's partition, delete files of the graduated grade.
# test changes:
#i=1; while [ $i -lt 13 ]; do mkdir -p "$i"grade/empty; touch "$i"grade/"$i"; ((i++)); done

rm -rf --one-file-system /srv/sambashared/12grade/*
i=12
while [ $i -gt 1 ]
do 
    j=$i
    i=$((i-1))
    SRC=/srv/sambashared/"$i"grade/
    DST=/srv/sambashared/"$j"grade
    rsync -aAXv --remove-source-files "$SRC" "$DST" && \
    find "$SRC" -mindepth 1 -type d -empty -delete
done

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$cat /etc/fstab
# /etc/fstab: static file system information.
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
/dev/mapper/root /               ext4    relatime,errors=remount-ro 0       1
# /boot was on /dev/sda2 during installation
UUID=2784575b-454e-116f-8384-f20d84e22e6f /boot           ext4    noatime         0       2
# /boot/efi was on /dev/sda3 during installation
UUID=32B4-7775  /boot/efi       vfat    umask=0077      0       1
/dev/mapper/home /home           ext4    defaults,relatime        0       2
LABEL=1grade /srv/sambashared/1grade            ext4    defaults,relatime,acl        0       2
LABEL=2grade /srv/sambashared/2grade            ext4    defaults,relatime,acl        0       2
LABEL=3grade /srv/sambashared/3grade            ext4    defaults,relatime,acl        0       2
LABEL=4grade /srv/sambashared/4grade            ext4    defaults,relatime,acl        0       2
LABEL=5grade /srv/sambashared/5grade            ext4    defaults,relatime,acl        0       2
LABEL=6grade /srv/sambashared/6grade            ext4    defaults,relatime,acl        0       2
LABEL=7grade /srv/sambashared/7grade            ext4    defaults,relatime,acl        0       2
LABEL=8grade /srv/sambashared/8grade            ext4    defaults,relatime,acl        0       2
LABEL=9grade /srv/sambashared/9grade            ext4    defaults,relatime,acl        0       2
LABEL=10grade /srv/sambashared/10grade            ext4    defaults,relatime,acl        0       2
LABEL=11grade /srv/sambashared/11grade            ext4    defaults,relatime,acl        0       2
LABEL=12grade /srv/sambashared/12grade            ext4    defaults,relatime,acl        0       2
/dev/mapper/usr /usr            ext4    defaults,relatime        0       2
/dev/mapper/var /var            ext4    defaults,relatime        0       2
LABEL=debcache /var/cache/squid-deb-proxy            ext4    defaults,relatime        0       2
LABEL=video /media/video          ext4    defaults,relatime        0       2
/dev/mapper/swap1 none            swap    sw              0       0
# 
LABEL=archive0 /media/archive0          ext4    defaults,relatime,noauto        0       0
LABEL=archive1 /media/archive1          ext4    defaults,relatime,noauto        0       0