What are deprecated?

• ifconfig
• netstats
• route

What are the better options?

• ip
• ss
• lsof -iTCP

Basic usages

Command ip

Show / manipulate routing, network devices, interfaces and tunnels

• Show ip adresses: ip address or ip a
• Show network devices: ip link or ip l
• Show routing table entry: ip route or …

What is sed?

sed is a “stream editor for filtering and transforming text”. Here is a very detailed tutorial.

Basic usages

Use “s” for substitution

Basic syntax:

echo "Sunday Monday" | sed 's/day/night/'

Sunnight Monday

Note that only the first occurrence of …

Today I tried to fix an old issue with an old laptop having dual boot - windows / ubuntu. This issue occurred one day out of nowhere (someone from forums said it was caused by a windows update).

While the windows system still boots, the laptop cannot boot into ubuntu and always gets stuck at a grub …