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This option displays a list of files that are included in an RPM package This option displays the functionality the specified package
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--requires
This useful option displays the functionality required by the specified package For example, in Figure 8-26, the rpm q --requires postfix command has been entered at the shell prompt
Notice that a list of system requirements is displayed on the screen Some of the information displayed refers to specific packages, such as netcfg Other lines refer to specific utilities or executables, such as /sbin/ip If you want to find out what packages provide the ip executable specified, you can enter rpm q --whatprovides ip at the shell prompt The rpm utility will then determine the name of the package that provides this program In Figure 8-27, you can see that the iproute2-2615-14 package provides the ip executable Before ending this chapter, let s discuss how you can use the rpm utility to verify packages
8: Installing and Managing Software on Linux
FIGURE 8-26
Using the q --requires option with rpm
Verifying Packages
In addition to querying packages, the rpm utility can also be used to verify packages on your system As you are probably (painfully) aware, software can get corrupted, deleted, or otherwise messed up on any given computer system, regardless of the operating system You can use the rpm utility to verify your installed packages and make sure everything is working the way it is supposed to This is done using the V option
FIGURE 8-27
Using the q --whatprovides option with rpm
Manage Installed Software
FIGURE 8-28
No errors detected by rpm
You can use V to verify a single package by specifying its package name, such as rpm V gftp You can also verify all packages on the system by entering rpm Va Regardless of which option you choose, rpm will return no output if no errors are found For example, in Figure 8-28, the rpm V gftp command was issued at the command prompt Because the package had no errors, nothing was written to the screen and the rpm utility exited If an error does occur, rpm prints out the error message and the associated file name, as shown in Figure 8-29 The error messages generated during the verification process follow the syntax of:
SM5DLUGT c file_name
The parameters in the error message stand for the following:
S M 5
FIGURE 8-29
Indicates a problem in the size of a file Indicates a problem with a file s mode Indicates a problem with the MD5 checksum of a file
Errors detected by rpm
8: Installing and Managing Software on Linux
D L U G T c
Indicates a problem with a file s revision numbers Indicates a problem with a file s symbolic link Indicates a problem with a file s ownership Indicates a problem with a file s group Indicates a problem with the modification time of a file Indicates the specified file is a configuration file Specifies the name of the file that failed verification
file_name
For example, refer back to Figure 8-29 Any time one of the preceding letters is represented by a in the output, it indicates that no problem was found with this parameter for the specified file A letter displayed indicates a problem was found for this particular parameter for the specified file For example, in Figure 8-29, the /etc/udev/rulesd/30-net_persistent_namesrules file had errors S, 5, and T, indicating there was a problem with the size, checksum, and modification time of the file We also know that it is a configuration file because there s a c on the line as well In Figure 8-29, notice that all of the errors encountered by rpm were associated with configuration files This actually isn t a problem Configuration files, naturally, get modified all the time and, hence, fail to verify If other files, such as executables, fail to verify, then you should be more concerned Based on the output from rpm V, you may determine that you need to repair an installed package You can use rpm to do this as well, using the U --replacepkgs option For example, if we determined that we needed to reinstall the gftp package, we could enter rpm U --replacepkgs gftp-2018-23i586rpm at the shell prompt to force rpm to install the gftp package from the original rpm even though it is already installed
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