Erreur sur un tar

#Fonction d'erreur, si une erreur il affichera un message d'erreur sous /var/log/messages
function error()
{
        logger "${LOG} -> ${1}"
        exit 1
}

tar --version

${ssh} .... ${BACKUPNAME}" || {echo "tar return value $?"; error "Impossible de créer le backup" ; }

 -rw-r--r--. 1 root        root        115568640 18 févr. 11:37 pc2.tar

-rw-r--r--. 1 root        root        115568640 18 févr. 11:47 pc2.tar

-rw-r--r--. 1 root        root        115568640 18 févr. 11:51 pc2.tar

${ssh} ${SSH_USER}@${IP_PC} -p ${SSH_PORT} "set -x tar --warning=no-file-changed -cf /tmp/${BACKUPNAME}.tar --directory=${REMOTE_DIR} ${BACKUPNAME}" > /tmp/log1 2>&1 || error "Impossible de créer le backup"

${ssh} ${SSH_USER}@${IP_PC} -p ${SSH_PORT} "set -x; tar --warning=no-file-changed -cf /tmp/${BACKUPNAME}.tar --directory=${REMOTE_DIR} ${BACKUPNAME} > /tmp/log1 2>&1" || error "Impossible de créer le backup"

dmesg

 || error "Impossible de créer le backup"

ssh root@ip -p 22 'tar -cvf /root/tmp/pc2.tar --directory=/mnt test > tar_stdout.log 2> tar_stderr.log; echo $?>tar_error.log'

RETURN VALUE
       Tar exit code indicates whether it was able to successfully perform the requested operation, and if not, what kind of error occurred.

       0      Successful termination.

       1      Some files differ.  ....

       2      Fatal error.  ....

cmd
reterr=$?
cmd2
if [ $reterr != 0 ] ...