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Debug service on OpenWrt
sed -r -i 's%^(#!.*)%\1\nset -x -v\nexec \&>/tmp/ddns-init.log%' /etc/init.d/ddns
sed -r -i 's%^(#!.*)%\1\nset -x -v\nexec \&>/tmp/ddns-hotplug.log%' /etc/hotplug.d/iface/95-ddns
sed -r -i 's%^(#!.*)%\1\nset -x -v\nexec \&>/tmp/ddns-updater.log%' /usr/lib/ddns/dynamic_dns_updater.sh
# $ head -5 /etc/init.d/ddns
# #!/bin/sh /etc/rc.common
# set -x -v
# exec &>/tmp/ddns-init.log
# START=95
# STOP=10
# ...
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