how to generate barcode in vb.net 2008 Creating and Deleting Directories in Software

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Creating and Deleting Directories
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You create and remove directories with the mkdir and rmdir commands In either case, you can also use pathnames for the directories In the next example, the user creates the directory reports Then the user creates the directory letters using a pathname:
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$ mkdir reports $ mkdir /home/chris/letters
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Execution Creates a directory Erases a directory Lists directory name with a preceding slash Lists working directory as well as all subdirectories Changes to the specified directory, making it the working directory cd without a directory name changes back to the home directory: $ cd reports Displays the pathname of the working directory A slash is used in pathnames to separate each directory name In the case of pathnames for files, a slash separates the preceding directory names from the filename References the parent directory You can use it as an argument or as part of a pathname: $ cd $ mv /larisa oldletters References the working directory You can use it as an argument or as part of a pathname: $ ls The tilde is a special character that represents the pathname for the home directory It is useful when you need to use an absolute pathname for a file or directory: $ cp monday ~/today
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TABLE 6-3 Directory Commands
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You can remove a directory with the rmdir command followed by the directory name In the next example, the user removes the directory reports with the rmdir command:
$ rmdir reports
To remove a directory and all its subdirectories, you use the rm command with the -r option This is a very powerful command and can easily be used to erase all your files If your rm command is aliased as rm -i (interactive mode), you will be prompted for each file To simply remove all files and subdirectories without prompts, add the -f option The following example deletes the reports directory and all its subdirectories:
PART II
rm -rf reports
Displaying Directory Contents
You have seen how to use the ls command to list the files and directories within your working directory To distinguish between file and directory names, however, you need to use the ls command with the -F option A slash is then placed after each directory name in the list
$ ls weather reports letters $ ls -F weather reports/ letters/
The ls command also takes as an argument any directory name or directory pathname This enables you to list the files in any directory without first having to change to that directory In the next example, the ls command takes as its argument the name of a directory, reports Then the ls command is executed again, only this time the absolute pathname of reports is used
$ ls reports monday tuesday $ ls /home/chris/reports monday tuesday $
Moving Through Directories
The cd command takes as its argument the name of the directory to which you want to change The name of the directory can be the name of a subdirectory in your working directory or the full pathname of any directory on the system If you want to change back to your home directory, you only need to enter the cd command by itself, without a filename argument
$ cd props $ pwd /home/dylan/props
Part II:
The Linux Shell and File Structure
Referencing the Parent Directory
A directory always has a parent (except, of course, for the root) For example, in the preceding listing, the parent for props is the dylan directory When a directory is created, two entries are made: one represented with a dot (), and the other with double dots () The dot represents the pathname of the directory, and the double dots represent the pathname of its parent directory Double dots, used as an argument in a command, reference a parent directory The single dot references the directory itself You can use the single dot to reference your working directory, instead of using its pathname For example, to copy a file to the working directory, retaining the same name, the dot can be used in place of the working directory s pathname In this sense, the dot is another name for the working directory In the next example, the user copies the weather file from the chris directory to the reports directory The reports directory is the working directory and can be represented with the single dot
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