Moved linux to new directory 'os'

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diff --git a/os/linux/linux-troubleshoot.md b/os/linux/linux-troubleshoot.md
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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
+$ sudo 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 $USER --reset
+```
+
+---
+
+#### Find top 10 largest files
+
+```bash
+$ find /path/to/dir/ -printf '%s %p\n'| sort -nr | head -10
+$ find . -printf '%s %p\n'| sort -nr | head -10
+```