How to change hostname on Ubuntu 18.04

Por -
$ sudo hostnamectl set-hostname <newname>

Change "preserve_hostname:" false to true on /etc/cloud/cloud.cfg

$ sudo vi /etc/cloud/cloud.cfg

Add newname to /etc/hosts

$ sudo vi /etc/hosts

127.0.0.1 <newname>

$ sudo reboot

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Cisco router password recovery

Por -
1) Press Break on the terminal keyboard a couple of times after you see the message program load complete, entry point: 0x80008000, size: 0x6fdb4c in order to put the router into ROMMON. 2) Type confreg 0x2142 at the rommon 1> prompt in order to boot from Flash. This step bypasses the startup configuration where the passwords are stored. 3)  Type reset at the rommon 2> prompt. The router reboots, but ignores the saved configuration. 4)  Type no after each setup question, or press Ctrl-C in order to skip the initial setup procedure. 5)  Type enable at the Router> prompt. You are in enable mode and should see the Router# prompt. 6)  Type   configure memory   or copy startup-config running-config in order to copy the nonvolatile RAM (NVRAM) into memory. 7)  Type show running-config. The passwords (enable password, enable secret, vty, and console passwords) are in either an encrypted or encrypted format. You can reuse ir change. 8)  Type configure terminal. The hostname (conf
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