Ubuntu 16.06 - rc.local tricks/tips

cat-chrome.sh

# Ensure that Google Chrome's script terminates subprocesses (like 'cat') properly
( if ! grep -q 'trap \"trap - SIGTERM && kill -- -$$\" SIGINT SIGTERM EXIT' /opt/google/chrome/google-chrome
  then
      LINE=$(( $(awk '$0 ~ "exec 2" {print NR}' /opt/google/chrome/google-chrome) + 1))
      /bin/ed /opt/google/chrome/google-chrome <<EOF
${LINE}i
trap "trap - SIGTERM && kill -- -\$\$" SIGINT SIGTERM EXIT
.
w
q
EOF
  fi ) &

rc.local

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#

# Use these settings to allow for CPU frequency scaling.
echo "ondemand" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo "1" > /sys/devices/system/cpu/cpu0/cpufreq/ondemand/ignore_nice

# Enable kernel memory de-duper (called Kernel Same-page Merging, or KSM)
echo 1 >/sys/kernel/mm/ksm/run
echo 1000 >/sys/kernel/mm/ksm/sleep_millisecs

# Check to see if we're on the QNET
if ! ip route get 8.8.8.8 | awk '{print $NF; exit}' | grep -q ^172.; then
    # Try one last time to get the assignment from the DHCP server.
    dhclient && service sign restart
fi

# Set my Time Zone.
timedatectl set-timezone $(curl -s http://freegeoip.net/json/$(dig +short myip.opendns.com @resolver1.opendns.com) | jq '.time_zone' | tr -d '"')

# Synchronize network time.
( /etc/init.d/ntp stop
until ping -nq -c3 8.8.8.8; do
   echo "Waiting for network..."
done
ntpd -gq
# or: `ntpdate -b -s 0.pool.ntp.org`
/etc/init.d/ntp start )&

# Set the core file pattern to be *much* more useful when debugging.
echo 'core_dump.file_name(%e).signal(%s).size(%c).process_id(%p).uid(%u).gid(%g).time(%t).initial_pid(%P).thread_id(%I)' > /proc/sys/kernel/core_pattern

exit 0