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You can enter rpm --checksig to verify the digital signature of an RPM package before you install it You can then enter rpm i to actually install the package file on your system We pointed out that many RPM packages are dependent on other packages being installed on the system for them to work properly If these packages aren t present, the software won t run The rpm utility automatically checks to see if dependent software is installed before it installs a new package You can also run rpm test to check for dependencies before installing We then discussed the process you need to follow to uninstall software from your Linux system We pointed out that the process required depends on how the software was installed in the first place Software installed from source code will use either an uninstall script in the original installation files or an UNINSTALL target in the Makefile file that is called using the configure and the make uninstall commands To uninstall an RPM package, you enter rpm e We also pointed out that you can use the rpm command to update an existing package to a newer version This is done using the rpm U command The rpm command can also be used to query and verify RPM packages To query a package, you use the q option with rpm To verify a package, you use the V option If you determine that a package has been damaged, you can re-install an existing package by entering rpm U --replacepkgs
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8: Installing and Managing Software on Linux
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You can use either graphical or command-line tools to manage Linux software A good Linux administrator can use either type of utility A great deal of software is freely available for Linux systems Your distribution CDs or DVD is a great resource for Linux software A variety of Web sites are available for downloading Linux software If possible, you should verify your downloads by comparing a checksum value
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you create with the sum command against the checksum value specified on the Web site where you obtained the file
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To install from source code, you first download and extract a tarball file In the installation directory, you run configure, make, and make install The configure command checks your system to verify compatibility and
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creates the Makefile file
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The make command compiles a binary executable from the source code text
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using the specifications in the Makefile file
The make install command installs the compiled executable RPM packages are installed using the Red Hat Package Manager (RPM) RPM packages are compiled for a specific architecture and sometimes a specific
Linux distribution
You can tell what architecture a package file is intended for by looking at the
file name, which contains the following information:
Package name Version number Release number Compatible distribution (optional) Architecture type You can enter rpm --checksig to verify the digital signature of an RPM
package before you install it
You can enter rpm i to install a package file on your system
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Manage Installed Software
The process required to uninstall software from a Linux system depends on
how the software was installed in the first place
Software installed from source code will use one of the following: An uninstall script in the original installation files An UNINSTALL target in the Makefile file that is called using the con-
figure and the make uninstall commands
To uninstall an RPM package, you use the rpm e command You can update an existing package to a newer version using the
rpm U command
The rpm command can be used to query and verify RPM packages To query a package, you use the q option with rpm To verify a package, you use the V option with rpm If you determine that a package has been damaged, you can re-install an
existing package by entering rpm U --replacepkgs
8: Installing and Managing Software on Linux
SELF TEST
Install Software on Linux
1 What type of software can be managed with a graphical software utility such as YaST A B C D RPM packages Text-based script files Software compiled from downloaded source code Programs compiled from source code written by the end user
2 You ve just downloaded a file named FC-6-i386-DVDiso to the /home/tux directory on your Linux system What command would you use to generate a checksum value A B C D checksum /home/tux/ FC-6-i386-DVDiso sum /home/tux/ FC-6-i386-DVDiso verify /home/tux/ FC-6-i386-DVDiso rpm V /home/tux/ FC-6-i386-DVDiso
3 You ve just downloaded a file named FC-6-i386-DVDiso and have generated a checksum value The value generated is slightly different from that shown on the download Web site What does this imply A The downloaded copy is different than the original; but the download is still usable as long as the differences are minor B The version number is incremented by 1 when the file was downloaded C The downloaded copy is different than the original copy and shouldn t be used D The downloaded copy is exactly the same as the original copy 4 You ve just downloaded a file named BitTorrent-501targz to your home directory Assuming the current directory is ~, what command would you enter at the shell prompt to extract all of the files from this archive A B C D gzip d / BitTorrent-501targz tar axvf / BitTorrent-501targz tar xvf / BitTorrent-501targz tar zxvf / BitTorrent-501targz
5 What does the configure script do in an application s installation directory (Choose two) A It compiles the source code into a binary executable B It checks the local system to verify that the necessary components are available
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