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This article explains basic commands for navigation within Linux file system. The diagram below represents (part of) a Linux file system know as Filesystem Hierarchy Standard. A line from one node to a node on its right indicates containment. For example, the student directory is contained within the home directory. 
1. When you are working within a shell terminal, you are always operating in a particular directory. To determine which directory you are in, use the pwd command: student@linuxgym:$ pwd /usr/local/bin
student@linuxgym:$ cd
student@linuxgym:$ pwd /home/student
student@linuxgym:$
2. Your home directory is the directory you are in when you first open the terminal. To go to your home directory from anywhere, just type "cd": student@linuxgym:$ pwd
/usr/local/bin
student@linuxgym:$ cd
student@linuxgym:$ pwd
/home/student
student@linuxgym:$ 3. An absolute path name is one beginning with the "/" character, which signifies the root of the file system tree. Therefore, another way of going to your home directory is: student@linuxgym:/etc$ cd /home/student
student@linuxgym:$ pwd
/home/student
student@linuxgym:$
4. A relative path is one which starts with the name of a directory connected to the current directory. For example, if you are in the /usr directory, then typing only "cd bin" (without preceding "bin" with "/") has the following effect: student@linuxgym:$ pwd
/usr
student@linuxgym:$ cd bin
student@linuxgym:$ pwd
/usr/bin
student@linuxgym:$
and you go to /usr/bin rather than /usr/local/bin or /bin. 5. To go to the directory containing the current working directory (also called the parent directory) type: student@linuxgym:$ pwd
/usr/bin
student@linuxgym:$ cd ..
student@linuxgym:$ pwd
/usr
student@linuxgym:$
6. The relative pathname of the current working directory is called "." (the full stop). Therefore typing: student@linuxgym:$ pwd
/usr/bin
student@linuxgym:$ cd .
student@linuxgym:$ pwd
/usr/bin
student@linuxgym:$
does not change the current working directory.
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Did You Know that bash shell saves a history of your commands only when you terminate your session and thus sometimes you cannot find a command you have used previously. To instruct bash to save your command every time you press ENTER add following lise into your ~/.bashrc file: 
ISSN 1836-5930
