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Modify line "if "$str" =~ "^ifname=" ; then" and line "if "$str" =~ "^host_ifname=" ; then". it's critical for the new version of bash in debian.
for str in $NETIF_OPTIONS; do \
# getting 'ifname' parameter value
if [[ echo "$str" =~ | grep -o "^ifname=" ]]; then
# remove the parameter name from the string (along with '=')
CTIFNAME=${str#*=};
fi
# getting 'host_ifname' parameter value
if [[ echo "$str" =~ | grep -o "^host_ifname=" ]]; then
# remove the parameter name from the string (along with '=')
VZHOSTIF=${str#*=};