Master Linux Filesystem: Essential Directories Every User Should Know
This guide explains how Linux manages storage as a single root hierarchy and details the purpose and typical contents of key directories such as /home, /bin, /dev, /etc, /usr, /var, and others, including quick commands to navigate to your home folder.
/home
Home directory, stores each user's personal files. When a new user is created, a subdirectory with the same name is added under /home (e.g., /home/zhangsan). Logging in automatically lands you in this directory.
Quick ways to return to your home directory: cd – no arguments.
cd ~cd /home/zhangsan/– explicit path.
/bin
Contains essential binary executables used by all users, such as ls, cat, cp, etc.
/dev
Device directory; stores device files representing hardware components, following the “everything is a file” philosophy.
/etc
Holds system-wide configuration files, including server setup directories, startup scripts, and user account information (e.g., /etc/passwd).
Directories used for FTP/NFS server configuration.
System startup and configuration scripts.
Files read during boot.
User login credentials.
/lib
Stores shared libraries required by programs and the system.
/media
Mount point for automatically detected removable media such as USB drives and optical discs.
/mnt
Provides a location for manually mounting additional file systems, like extra hard drives.
/root
Home directory of the superuser (root).
/usr
Contains user applications and files, similar to Windows “Program Files”. It includes three important sub‑directories: /usr/bin – regular user applications. /usr/sbin – system administration binaries. /usr/src – source code, typically the kernel source.
/boot
Holds files needed for booting the Linux kernel.
/lost+found
Used by the filesystem to recover files after an improper shutdown; normally empty.
/opt
Optional software packages can be installed here.
/proc
Virtual filesystem exposing kernel and process information; reading files under /proc provides system status.
/sbin
Contains binaries for system administration tasks, primarily used by the superuser.
/srv
Stores data for services provided by the system (e.g., web server files).
/tmp
Temporary files created by applications; cleared on reboot.
/var
Variable data such as logs, mail spools, and other files that change frequently.
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Liangxu Linux
Liangxu, a self‑taught IT professional now working as a Linux development engineer at a Fortune 500 multinational, shares extensive Linux knowledge—fundamentals, applications, tools, plus Git, databases, Raspberry Pi, etc. (Reply “Linux” to receive essential resources.)
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