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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)
- - -
#### Reload a program from tty if gui becomes unresponsive
```bash
$ DISPLAY=:<n> <name of program>
```
Example:
``` bash
$ DISPLAY=:0 xterm &
$ DISPLAY=:0 sxhkd &
```
- - -
#### Fix pacman keyring errors
```bash
$ pacman-key --init && pacman-key --populate archlinuxarm
$ rm /var/lib/pacman/db.lck
```
- - -
#### Clean package manager's cache (apt/pacman)
apt:
```bash
$ sudo apt-get clean
$ sudo apt-get autoclean
```
pacman:
```bash
$ paccache -r # requires pacman-contrib
$ sudo pacman -Scc
```
- - -
#### Unlocking a Linux User Account After Too Many Failed Attempts
```bash
$ faillock --user $USER --reset
```
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