转载--linux filesystem structures

In this article,let us review the Linux filesystem structures and understand the meaning of individual high-level directories.

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.
• For example,/srv/cvs contains CVS related data.

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