...but even I create a non-chroot shell user, I assume that ISPConfig is still assigning the new created user jailroot attributes
So this is what I found in the created crontab:
45 16 * * 2 web5 /BackupWpress.sh
As said even I assign it "none" by the chroot option, you see here the cronjob got something related to jailrooted users "SHELL='/usr/sbin/jk_chrootsh'"
And I used of course full path in my script ! Unforunately this feature is really still confusing on ispconfig.