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## Useful troubleshooting commands/tools
#### Internet/network:
- ifconfig (install net-tools)
- Manage interface configurations/parameters
- Enable/disable a network interface
- View all available interfaces, IP addresses, hardware addresses
- Assign an IP address and netmask to a selected interface
- ip
- Alternate to ifconfig, display network interfaces and configure network devices
- Interact with layers of TCP/IP protocol (Data link layer and Network layer)
- Can show and modify kernal routing tables (+/- ARP cache entries)
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#### Reload a program from tty if gui becomes unresponsive
`$ DISPLAY=:<n> <name of program>`
Example:
```
`$ DISPLAY=:0 xterm &`
`$ DISPLAY=:0 sxhkd &`
```
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#### Fix pacman keyring errors
``` bash
`$ pacman-key --init && pacman-key --populate archlinuxarm`
`$rm /var/lib/pacman/db.lck`
```
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