cd changes your working directory in .NET Creation barcode 128 in .NET cd changes your working directory

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cd changes your working directory use .net vs 2010 barcode 128a creation todeploy barcode code 128 in .net PDF-417 2d barcode by Alex. When used visual .net code 128c without an argument, cd makes your home directory the working directory, as it was when you logged in.

The second cd command in Figure 6-9 does not have an argument so it makes Alex s home directory the working directory. Finally, knowing that he is working in his home directory, Alex uses a simple filename to make the literature directory his working directory (cd literature) and confirms the change with pwd..

The working direct ory versus your home directory tip The working directory is not the same as your home directory. Your home directory remains the. same for the durat .net vs 2010 code 128 barcode ion of your session and usually from session to session. Immediately after you log in, you are always working in the same directory: your home directory.

Unlike your home directory, the working directory can change as often as you like. You have no set working directory, which explains why some people refer to it as the current directory. When you log in and until you change directories by using cd, your home directory is your working directory.

If you were to change directories to Scott s home directory, then Scott s home directory would be your working directory.. The . and .. Directory Entries The mkdir utility code-128b for .NET automatically puts two entries in each directory you create: a single period (.) and a double period (.

.). The .

is synonymous with the pathname of the working directory and can be used in its place; the .. is synonymous with the pathname of the parent of the working directory.

These entries are hidden because their filenames begin with a period. With the literature directory as the working directory, the following example uses ..

three times: first to list the contents of the parent directory (/home/alex), second to copy the memoA file to the parent directory, and third to list the contents of the parent directory again.. $ pwd /home/alex/l iterature $ ls .. demo literature names $ cp memoA .

. $ ls ..

demo literature memoA. temp names temp 198 6 The Linux Filesystem After using cd to Visual Studio .NET code 128 barcode make promo (a subdirectory of literature) his working directory, Alex can use a relative pathname to call vim to edit a file in his home directory..

$ cd promo $ vim ../../names You can use an abs Code 128 Code Set B for .NET olute or relative pathname or a simple filename virtually anywhere that a utility or program requires a filename or pathname. This usage holds true for ls, vim, mkdir, rm, and most other Linux utilities.

. Important Standard Directories and Files Originally files o barcode code 128 for .NET n a Linux system were not located in standard places. The scattered files made it difficult to document and maintain a Linux system and just about impossible for someone to release a software package that would compile and run on all Linux systems.

The first standard for the Linux filesystem, the FSSTND (Linux Filesystem Standard), was released on February 14, 1994. In early 1995 work was started on a broader standard covering many UNIX-like systems: FHS (Linux Filesystem Hierarchy Standard, www.pathname.

com/fhs). More recently FHS has been incorporated in LSB (Linux Standard Base, www.linuxbase.

org), a workgroup of FSG (Free Standards Group,

Figure 6-10 shows the locations of some important directories and files as specified by FHS. The significance of many of these directories will become clear as you continue reading. The following list describes the directories shown in Figure 6-10, some of the directories specified by FHS, and some other directories.

Fedora/RHEL, however, does not use all the directories specified by FHS. Be aware that you cannot always determine the function of a directory by its name. For example, although /opt stores add-on software, /etc/opt stores configuration files for the software in /opt.

See also Important Files and Directories on page 468..
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