vb.net barcode component UNDERS TA NDIN G LINUX FILES AN D US ERS in Java

Print ANSI/AIM Code 39 in Java UNDERS TA NDIN G LINUX FILES AN D US ERS

CHAPTER 14 UNDERS TA NDIN G LINUX FILES AN D US ERS
Generate Code39 In Java
Using Barcode creation for Java Control to generate, create USS Code 39 image in Java applications.
www.OnBarcode.com
Decode Code 39 Extended In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
File Searches
Make Code-128 In Java
Using Barcode creator for Java Control to generate, create USS Code 128 image in Java applications.
www.OnBarcode.com
Generating Matrix 2D Barcode In Java
Using Barcode generator for Java Control to generate, create 2D image in Java applications.
www.OnBarcode.com
Files frequently get lost. Well, technically speaking, they don t actually get lost. We just forget where we ve put them. But because of this, the shell includes some handy commands to search for files.
Generating GS1 DataBar-14 In Java
Using Barcode creation for Java Control to generate, create GS1 DataBar Limited image in Java applications.
www.OnBarcode.com
Printing QR Code JIS X 0510 In Java
Using Barcode encoder for Java Control to generate, create QR Code image in Java applications.
www.OnBarcode.com
Using the find Command
Drawing EAN / UCC - 13 In Java
Using Barcode drawer for Java Control to generate, create GTIN - 128 image in Java applications.
www.OnBarcode.com
USPS OneCode Solution Barcode Drawer In Java
Using Barcode maker for Java Control to generate, create 4-State Customer Barcode image in Java applications.
www.OnBarcode.com
The find command manually searches through all the files on the hard disk. It s not a particularly fast way of finding a file, but it is reliable. Here s an example:
Generate Code-39 In VB.NET
Using Barcode generation for .NET framework Control to generate, create Code39 image in .NET applications.
www.OnBarcode.com
Creating Code 39 Extended In Objective-C
Using Barcode encoder for iPhone Control to generate, create USS Code 39 image in iPhone applications.
www.OnBarcode.com
find /home/keir -name "myfile"
Make DataBar In .NET
Using Barcode printer for .NET Control to generate, create GS1 DataBar image in VS .NET applications.
www.OnBarcode.com
Code 39 Encoder In Objective-C
Using Barcode maker for iPad Control to generate, create Code 39 Full ASCII image in iPad applications.
www.OnBarcode.com
This will search for myfile using /home/keir as a starting point (which is to say that it will search all directories within /home/keir, any directories within those directories, and so on, because it s recursive). To search the entire file system, type / as the path. Remember that / is interpreted by BASH as the root of the file sytem. If the file is found, you ll see it appear in the output of the command. The full path will be shown next to the filename. If you give find a try, you ll see that it s not a particularly good way of searching. Apart from being slow, it will also return a lot of error messages about directories it cannot search. This is because, when you run the find command, it takes on your user permissions. Whenever find comes across a directory it cannot access, it will report it to you, as shown in the example in Figure 14-4. There are frequently so many of these warnings that the output can hide the instances where find actually locates the file in question! You can avoid these error messages in various ways, but perhaps the quickest solution is to preface the find command with sudo to invoke superuser powers. In this way, you ll have access to every file on the hard disk, so the find command will be unrestricted in where it can search and won t run into any directories it doesn t have permission to enter.
GTIN - 13 Encoder In C#.NET
Using Barcode printer for VS .NET Control to generate, create EAN-13 Supplement 5 image in Visual Studio .NET applications.
www.OnBarcode.com
Read UPCA In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Caution Using the sudo command with find may represent an invasion of privacy if you have more than one user on your system. The find command will search other users /home directories and report any instances of files found there, too.
PDF 417 Reader In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Code39 Printer In C#
Using Barcode encoder for .NET Control to generate, create Code 39 image in .NET framework applications.
www.OnBarcode.com
However, an even better solution for finding files is to use the locate command.
PDF417 Creation In None
Using Barcode generation for Software Control to generate, create PDF 417 image in Software applications.
www.OnBarcode.com
Printing EAN128 In VB.NET
Using Barcode creator for .NET framework Control to generate, create UCC.EAN - 128 image in .NET applications.
www.OnBarcode.com
CHAPTER 14 UN DERS TANDING LINUX FILES AN D US ERS
Printing DataMatrix In .NET Framework
Using Barcode creation for .NET framework Control to generate, create Data Matrix ECC200 image in .NET framework applications.
www.OnBarcode.com
GS1 - 12 Creation In Visual Studio .NET
Using Barcode drawer for Reporting Service Control to generate, create UPC-A Supplement 2 image in Reporting Service applications.
www.OnBarcode.com
Figure 14-4. The find command is useful for finding files but isn t problem-free.
Using the locate Command
The alternative to using find is to use the locate command. This is far quicker than find, because it relies on a central database of files, which is periodically updated. In other words, it doesn t literally search the file system each time. The problem is that if you ve saved a file recently and are hoping to find it, there s a chance that it won t yet appear in locate s database, so it won t turn up in the list of results. Using locate is easy. You can use the following command to search for a file (you don t need to precede the command with sudo):
locate myfile
It s possible to update the locate database manually, although this might take a few minutes to work through. Simply issue the command:
sudo updatedb
After this, all files in the system should be indexed, making your search results more accurate.
CHAPTER 14 UNDERS TA NDIN G LINUX FILES AN D US ERS
Using the whereis Command
One other command worth mentioning in the context of searching is whereis. This locates where programs are stored and is an excellent way of exploring your system. Using it is simply a matter of typing something like this:
whereis cp
This will tell you where the cp program is located on your hard disk. It will also tell you were its source code and man page are located (if applicable). However, the first path returned by the search will be the location of the program itself.
File Size and Free Space
Often, it s necessary to know how large files are and to know how much space they re taking up on the hard disk. In addition, it s often handy to know how much free space is left on a disk.
Copyright © OnBarcode.com . All rights reserved.