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VMware ESXi 6.5.0 build-8294253
XSIBackup version 1.5.1.10

When executing the following command :

./xsibackup --replica=cbt "VMs(vmname)" "root@192.168.1.1:22:/vmdks/replicas/$(( $(date +%j) % 5 ))"

I'm getting this error :

-sh: arithmetic syntax error

192.168.1.1 is running Rocky Linux 8.5

Thanks,
Dale