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Introduction gzip and gunzip are GNU file compression and decompression utilities. Usually, files that have been compressed by gzip will have a .gz extension. However, sometimes you may see a file that has a .tgz extension. This is a TAR file that has been compressed by gzip. The .tgz extension  [ Read More ]

Introduction Every file and directory in Unix/Linux has read, write, and execute permissions. Read permission means that the file can be read but not modified or deleted. Write permission means that the file can be created, modified, or deleted. Execute permission means that the file can be executed. The execute  [ Read More ]

Introduction chown is a standard Unix/Linux command that allows you to change the owner of a file/directory. To view the current owner of a file, execute the command ls -l. This will display the files in the current directory in long format. The third column in the table is the  [ Read More ]

Introduction newgrp is a command that allows you to change the group you are currently a member of. It allows you to be be a member of more than one group and switch groups by executing the newgrp command. Using newgrp Most users are by default in the users group.  [ Read More ]

Introduction A group is a way to organize users on any Unix-based machine including Linux. Members of a group can share files and directories. For instance, if you have two webmasters of an internet site and both need access to read/write to the files and directories for the website, the  [ Read More ]

Introduction The PATH is an environment variable that is a list of directories that the operating system looks in to find commands issued by the user. For example, when you type ls to list files, you are actually executing /bin/ls because the /bin directory is in your path by default.  [ Read More ]

Using the Command Line Note: You must have root access to add a user. If you are logged in as a regular user and know the root password, you can type the command su. This will prompt you for a password. Enter the root password correctly and you will have  [ Read More ]

Introduction bzip2 and bunzip2 are file compression and decompression utilities. The bzip2 and bunzip2 utilities are newer than gzip and gunzip and are not as common yet, but they are rapidly gaining popularity. The bzip2 utility is capable of greater compression ratios than gzip. Therefore, a bzip2 file can be  [ Read More ]

Introduction An installation boot disk is used to install Linux on a computer that cannot boot from the CD-ROM. A Linux installation boot disk can be created from both Linux and Windows. Although this guide is specific to Red Hat, the same principles should apply to other distributions. Making a  [ Read More ]

by Tammy Fox Introduction PrintTool is a Red Hat utility to configure a printer in Linux. This utility is a graphical interface that modifies the /etc/printcap configuration file. The daemon lpd controls print access in Linux. You must be root to add a printer and restart the daemon. After modifying  [ Read More ]