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type: txt
help: Set loopback interface
allowed: echo "lo"
syntax:expression: exec "\
if [ ! -d /sys/class/net/$VAR(@) ]; then \
echo \"loopback interface $VAR(@) does not exist\"; \
exit 1; \
elif [ $(cat /sys/class/net/$VAR(@)/type) -ne 772 ]; then \
echo \"interface $VAR(@) is not a loopback interface\"; \
exit 1; \
fi"
update: sudo ip link set $VAR(@) up
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