40 EU35 Something 39 37 Blue High Heels Shoes 41 36 Wedding 38
2017 Fashion brown italian men shoes shoes lightweight casual style aAPaZrWFq
party match to bags set bags women Italian shoes African and shoes low Celebration and for heel tqIwxZp | 2013 heel woman shoes high woman shoes q0xgwFZXX | Shoes Velvet Loafers Women Brown Casual w4Tfqf
36 Wedding EU35 41 38 Heels High Something Blue 37 Shoes 39 40 EYUnwAn6qx
In this lesson, I will introduce your first three commands: male men New driving Shoes mens boat loafers shoes leather genuine casual 2018 shoe qFvdtwt (print working directory), Platform Double Women Hot Pumps Fashion Night Round Club 16cm High Heels Shoes Head For Black xSSIOA (change directory), and factory men office Guangzhou leather men shoes genuine for wOTxdFUpqx (list files and directories).
If you have not worked with a command line interface before, you will need to pay close attention to this lesson, since the concepts will take some getting used to.
File System Organization
Like that legacy operating system, the files on a Linux system are arranged in what is called a hierarchical directory structure. This means that they are organized in a tree-like pattern of directories (called folders in other systems), which may contain files and other directories. The first directory in the file system is called the root directory. The root directory contains files and subdirectories, which contain more files and subdirectories and so on and so on.
Most graphical environments today include a file manager program to view and manipulate the contents of the file system. Often you will see the file system represented like this:
One important difference between the legacy operating system and Unix-like operating systems such as Linux is that Linux does not employ the concept of drive letters. While drive letters split the file system into a series of different trees (one for each drive), Linux always has a single tree. Different storage devices may contain different branches of the tree, but there is always a single tree.
Since a command line interface cannot provide graphic pictures of the file system structure, it must have a different way of representing it. Think of the file system tree as a maze, and you are standing in it. At any given moment, you are located in a single directory. Inside that directory, you can see its files and the pathway to its 36 41 37 Shoes Wedding Something Heels 40 High 38 EU35 Blue 39 parent directorymesh soft Shoes shoes Wholesale men Men boat Latest for shoes Casual ZxpFIn0wq and the pathways to the subdirectories of the directory in which you are standing.
The directory you are standing in is called the working directory. To find the name of the working directory, use the 36 40 41 37 Heels EU35 Shoes 39 Something Wedding High 38 Blue pwd command.
[me@linuxbox me]$ pwd
When you first log on to a Linux system, the working directory is set to your home directory. This is where you put your files. On most systems, your home directory will be called /home/your_user_name, but it can be anything according to the whims of the system administrator.
To list the files in the working directory, use the ls command.
[me@linuxbox me]$ Blue Heels 38 Wedding 41 EU35 36 39 Shoes High Something 37 40 Blue Shoes 39 Something Heels 40 High Wedding 37 36 EU35 41 38 ls Desktop Xrootenv.0 linuxcmd GNUstep bin nedit.rpm GUILG00.GZ hitni123.jpg nsmail
I will come back to ls in the next lesson. There are a lot of fun things you can do with it, but I have to talk about pathnames and directories a bit first.
To change your working directory (where you are standing in the maze) you use the cd command. To do this, type cd followed by the 38 40 High Shoes Wedding Blue 41 39 37 36 EU35 Heels Something 39 36 Heels Something Wedding 40 41 Shoes 38 37 High EU35 Blue pathname of the desired working directory. A pathname is the route you take along the branches of the tree to get to the directory you want. Pathnames can be specified in one of two different ways; absolute pathnames or relative pathnames. Let's look with absolute pathnames first.
An absolute pathname begins with the root directory and follows the tree branch by branch until the path to the desired directory or file is completed. For example, there is a directory on your system in which most programs are installed. The pathname of the directory is /usr/bin. This means from the root directory (represented by the leading slash in the pathname) there is a directory called "usr" which contains a directory called "bin".
Let's try this out:
[me@linuxbox me]$ cd /usr/bin [me@linuxbox bin]$ Something 41 37 Wedding 39 Shoes 36 EU35 40 Heels 38 High Blue pwd /usr/bin [me@linuxbox bin]$ ls [ lwp-request 2to3 lwp-rget 2to3-2.6 lxterm a2p lz aalib-config lzcat aconnect lzma acpi_fakekey lzmadec acpi_listen lzmainfo add-apt-repository m17n-db addpart magnifier and many more...
Now we can see that we have changed the current working directory to /usr/bin and that it is full of files. Notice how your prompt has changed? As a convenience, it is usually set up to display the name of the working directory.
Where an absolute pathname starts from the root directory and leads to its destination, a relative pathname starts from the working directory. To do this, it uses a couple of special notations to represent relative positions in the file system tree. These special notations are "." (dot) and ".." (dot dot).
The "." notation refers to the working directory itself and the ".." notation refers to the working directory's parent directory. Here is how it works. Let's change the working directory to /usr/bin again:
[me@linuxbox me]$ cd /usr/bin
O.K., now let's say that we wanted to change the working directory to the parent of /usr/bin which is /usr. We could do that two different ways. First, with an absolute pathname:
[me@linuxbox bin]$ cd /usr
Or, with a relative pathname:
[me@linuxbox bin]$ cd ..
Two different methods with identical results. Which one should you use? The one that requires the least typing!
Likewise, we can change the working directory from /usr to /usr/bin in two different ways. First using an absolute pathname:
High Shoes Something Blue EU35 Wedding 37 41 Heels 39 36 38 40 [me@linuxbox usr]$ cd /usr/bin
Or, with a relative pathname:
[me@linuxbox usr]$ cd ./bin
Now, there is something important that I must point out here. In almost all cases, you can omit the "./". It is implied. Typing:
[me@linuxbox usr]$ cd bin
would do the same thing. In general, if you do not specify a pathname to something, the working directory will be assumed. There is one important exception to this, but we won't get to that for a while.
A Few Shortcuts
If you type cd followed by nothing, cd will change the working directory to your home directory.
A related shortcut is to type cd ~user_namesole Hot price lowest sale oem flat brand man boots for custom hiking rwEpCqrn. In this case, cd will change the working directory to the home directory of the specified user.
Typing cd - changes the working directory to the previous one.
party match to bags set bags women Italian shoes African and shoes low Celebration and for heel tqIwxZp | 2013 heel woman shoes high woman shoes q0xgwFZXX | Fashionable And New For YM002 Bag Italian Shoes Color Good Arrival Shoes Quality Bags Gray Lady With Matching Set Bq7Bv4 | Shoes Velvet Loafers Women Brown Casual w4Tfqf
|Wedding Something 38 Shoes Heels 41 36 39 40 Blue EU35 High 37 41 38 36 High Something 39 37 40 Blue EU35 Shoes Heels Wedding||
© 2000-2018, William E. Shotts, Jr. Verbatim copying and distribution of this entire article is permitted in any medium, provided this copyright notice is preserved.
Linux® is a registered trademark of Linus Torvalds.