TAILIEUCHUNG - Networking: A Beginner’s Guide Fifth Edition- P74

Networking: A Beginner’s Guide Fifth Edition- P74:I have run into many people over the years who have gained good even impressive working knowledge of PCs, operating systems, applications, and common problems and solutions. Many of these people are wizards with desktop computers. | Chapter 21 Introduction to Linux Systems Administration 347 NOTE Under Linux you cannot abbreviate the rmdir command as rd as you can under DOS. pwd Print Working Directory It is inevitable that eventually you will sit down in front of an already logged-in workstation and not know where you are located in the directory tree. To get this information you need the pwd command. It has no parameters and its only task is to print the current working directory. The DOS equivalent is to type cd alone however under bash typing cd simply takes you back to your home directory. For example to get the current working directory enter the following command root@ford src pwd usr local src tar Tape Archive If you are familiar with the pkzip program you are used to compression tools not only reducing file size but also combining multiple files into a single large file. Linux separates this process into two tools. The compression tool is gzip which was discussed earlier. The tar program combines multiple files into a single large file. The reason for separating this program from the compression tool is that tar allows you to select which compression tool to use or whether you even want compression. Additionally tar is able to read and write to devices in much the same way that dd can thus making tar a good tool for backing up tape devices. gNOTE Although the name of the program includes the word tape you do not need to read or write to a tape drive when creating archives. In fact you will rarely use tar with a tape drive in your day-to-day work aside from your backups . The format of the tar command is as follows root@ford root tar commands and options filenames Some of options available to tar are listed in Table 21-8. Refer to the man page for the complete list. For example to create an archive called containing all the files from usr src apache type the following root@ford src tar -cf usr src apache To create an archive called containing all the .

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