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+---
+title: Linux Directories
+parent: Cybersecurity Linux
+grand_parent: Class Notes
+---
+# Linux Directories
+Cybersecurity Linux Lesson 1.1.1
+
+___
+## <span style="color:rgb(255, 0, 0)">/boot</span>  (boot)
+-  The /boot (read as root, boot) directory contains all the files required for the system's boot process
+	- Includes the kernel of the system, RAM images, bootloader configuration files, etc.  
+## <span style="color:rgb(255, 0, 0)">/proc</span>   (processes)
+- The /proc directory contains information about processes, hardware configuration, and kernel parameters
+	- E.g. /proc/in.fo provides information about the system's CPU  
+## <span style="color:rgb(255, 0, 0)">/sys</span>    (system info)
+- The /sys directory holds information about the kernel parameters and device attributed
+    - E.g. /sys/gpio can manipulate the GPIO pins on embedded systems
+## <span style="color:rgb(255, 0, 0)">/var</span>    (variables)
+- The /var directory contains all the files that change while the system is being used
+	- Mainly used for storing variables data that is generated by services and applications
+	- Logs are stored in /var/log
+	- Cached data is stored in /var/cache  
+## <span style="color:rgb(255, 0, 0)">/usr</span>    (user's info)
+- The /usr directory contains data and resources about system users
+	- /usr/bin contains commands, executables, utilities, and applications
+	- /usr/share contains fonts, images, documentations, etc
+## <span style="color:rgb(255, 0, 0)">/lib</span>    (libraries)
+- The /lib directory contains libraries for the system typically needed for the early stages of the boot process
+	- Occassionally split in /lib32 and /lib 64 for 32-bit and 64-bit libraries, respectively  
+## <span style="color:rgb(255, 0, 0)">/dev</span>    (hardware devices)
+- The /dev directory contains device files that provide access to hardware devices on the system
+	- /dev/sda typically represents the first hard drive (or /dev/sda1 as first partition)
+	- /dev/ttyS0 is usually a serial port
+	- /dev/null and /dev/zero are used for input/output
+## <span style="color:rgb(255, 0, 0)">/etc</span>    (config files)
+- The /etc directory contains configuration files and shell scripts for the system
+	- /etc/fstab is the file system table  
+## <span style="color:rgb(255, 0, 0)">/opt </span>   (optional software)
+- The /opt directory holds optional/add-on software packages
+	- Allows for easy management and helps prevent conflicts with system files  
+## <span style="color:rgb(255, 0, 0)">/bin</span>    (binaries or commands)
+- The /bin directory contains the essential executable files for the system to function
+	- Contains the fundamental commands for the system to function including ls, cp, mv, etc.
+## <span style="color:rgb(255, 0, 0)">/sbin </span>  (system binaries or commands)
+- The /sbin directory is reserved for system administrators and contained essential system binaries
+	- Commands included within this directory are fdisk, reboot, and ifconfig 
+	- These commands must be run as superuser
+## <span style="color:rgb(255, 0, 0)">/home</span>   (user directory folder)
+- The /home directory is where system users home directories are located
+	- /home/student would be the home directory for a user, student  
+## <span style="color:rgb(255, 0, 0)">/root</span>   (root directory folder)
+- The /root directory is the home directory for the superuser/root account
+	- Contains config files, scripts, etc.
+## <span style="color:rgb(255, 0, 0)">/media</span>  (removable storage devices)
+- The /media directory is used as a mount point for removable media devices such as USB drives, external hard drives, optical discs, etc.  
+## <span style="color:rgb(255, 0, 0)">/mnt</span>    (mount point)
+- The /mnt directory is a general-purpose mount point used for temporarily mounting filesystems or devices
+	- /mnt can be used for any kind of mount operation  
+## <span style="color:rgb(255, 0, 0)">/tmp</span>    (temporary files)
+- The /tmp directory is a location for storing temporary files and directories
+	- May be deleted by the system during reboots or to free up disk space