find files that contain string

# grep -Hirn "mystring" /path/to/dir
# find . -print0 | xargs -0 -n1 -P8 grep -Hirn 

thanks to sifu enshu

error: Diskfilter writes are not supported

# cp -p /etc/grub.d/10_linux /etc/grub.d/10_linux.`date +%Y%m%d.%H%M`
# sed -i 's/quick_boot="1"/quick_boot="0"/' /etc/grub.d/10_linux
# update-grub
# reboot

share internet connection in linux via terminal

On access point side

1. disable firewall
2. enable packet forwarding
   # echo 1 > /proc/sys/net/ipv4/ip_forward
3. set iptables rule for port forwarding
   # iptables -t nat -A POSTROUTING -o -j MASQUERADE

on client side:

1. configure network interface so you can reach the access point
2. set the access point as default gateway
   # route add default gw
3. set dns resolution
   # echo nameserver 8.8.8.8 >> /etc/resolv.conf