1. / – Root * Every single file and directory starts from the root directory. * Only root user has write privilege under this directory. * Please note that /root is root user’s home directory, which is not same as /.
2. /bin – User Binaries * Contains binary executables. * Common linux commands you need to use in single-user modes are located under this directory. * Commands used by all the users of the system are located here. * For example: ps, ls, ping, grep, cp.
3. /sbin – System Binaries * Just like /bin, /sbin also contains binary executables. * But, the linux commands located under this directory are used typically by system aministrator, for system maintenance purpose. * For example: iptables, reboot, fdisk, ifconfig, swapon
4. /etc – Configuration Files * Contains configuration files required by all programs. * This also contains startup and shutdown shell scripts used to start/stop individual programs. * For example: /etc/resolv.conf, /etc/logrotate.conf
5. /dev – Device Files * Contains device files. * These include terminal devices, usb, or any device attached to the system. * For example: /dev/tty1, /dev/usbmon0
6. /proc – Process Information * Contains information about system process. * This is a pseudo filesystem contains information about running process. For example: /proc/{pid} directory contains information about the process with that particular pid. * This is a virtual filesystem with text information about system resources. For example: /proc/uptime
7. /var – Variable Files * var stands for variable files. * Content of the files that are expected to grow can be found under this directory. * This includes — system log files (/var/log); packages and database files (/var/lib); emails (/var/mail); print queues (/var/spool); lock files (/var/lock); temp files needed across reboots (/var/tmp);
8. /tmp – Temporary Files * Directory that contains temporary files created by system and users. * Files under this directory are deleted when system is rebooted.
9. /usr – User Programs * Contains binaries, libraries, documentation, and source-code for second level programs. * /usr/bin contains binary files for user programs. If you can’t find a user binary under /bin, look under /usr/bin. For example: at, awk, cc, less, scp * /usr/sbin contains binary files for system administrators. If you can’t find a system binary under /sbin, look under /usr/sbin. For example: atd, cron, sshd, useradd, userdel * /usr/lib contains libraries for /usr/bin and /usr/sbin * /usr/local contains users programs that you install from source. For example, when you install apache from source, it goes under /usr/local/apache2
10. /home – Home Directories * Home directories for all users to store their personal files. * For example: /home/john, /home/nikita
11. /boot – Boot Loader Files * Contains boot loader related files. * Kernel initrd, vmlinux, grub files are located under /boot * For example: initrd.img-2.6.32-24-generic, vmlinuz-2.6.32-24-generic
12. /lib – System Libraries * Contains library files that supports the binaries located under /bin and /sbin * Library filenames are either ld* or lib*.so.* * For example: ld-2.11.1.so, libncurses.so.5.7
13. /opt – Optional add-on Applications * opt stands for optional. * Contains add-on applications from individual vendors. * add-on applications should be installed under either /opt/ or /opt/ sub-directory.
14. /mnt – Mount Directory * Temporary mount directory where sysadmins can mount filesystems.
15. /media – Removable Media Devices * Temporary mount directory for removable devices. * For examples, /media/cdrom for CD-ROM; /media/floppy for floppy drives; /media/cdrecorder for CD writer
16. /srv – Service Data * srv stands for service. * Contains server specific services related data.