Perhaps you have deleted some files by accident, but you are not sure what you deleted. To verify your entire system and see what might be missing, you could try the following command:
rpm -Va
If some files are missing or appear to have been corrupted, you should probably either re-install the package or uninstall and then re-install the package.
At some point, you might see a file that you do not recognize. To find out which package owns it, enter:
rpm -qf /usr/bin/ghostscript
The output would look like the following:
ghostscript-8.70-1.el6.x86_64
We can combine the above two examples in the following scenario. Say you are having problems with /usr/bin/paste. You would like to verify the package that owns that program, but you do not know which package owns paste. Enter the following command,
rpm -Vf /usr/bin/paste
and the appropriate package is verified.
Do you want to find out more information about a particular program? You can try the following command to locate the documentation which came with the package that owns that program:
rpm -qdf /usr/bin/free
The output would be similar to the following:
/usr/share/doc/procps-3.2.8/BUGS
/usr/share/doc/procps-3.2.8/FAQ
/usr/share/doc/procps-3.2.8/NEWS
/usr/share/doc/procps-3.2.8/TODO
/usr/share/man/man1/free.1.gz
/usr/share/man/man1/pgrep.1.gz
/usr/share/man/man1/pkill.1.gz
/usr/share/man/man1/pmap.1.gz
/usr/share/man/man1/ps.1.gz
/usr/share/man/man1/pwdx.1.gz
/usr/share/man/man1/skill.1.gz
/usr/share/man/man1/slabtop.1.gz
/usr/share/man/man1/snice.1.gz
/usr/share/man/man1/tload.1.gz
/usr/share/man/man1/top.1.gz
/usr/share/man/man1/uptime.1.gz
/usr/share/man/man1/w.1.gz
/usr/share/man/man1/watch.1.gz
/usr/share/man/man5/sysctl.conf.5.gz
/usr/share/man/man8/sysctl.8.gz
/usr/share/man/man8/vmstat.8.gz
You may find a new RPM, but you do not know what it does. To find information about it, use the following command:
rpm -qip crontabs-1.10-32.1.el6.noarch.rpm
The output would be similar to the following:
Name : crontabs Relocations: (not relocatable)
Version : 1.10 Vendor: Red Hat, Inc.
Release : 32.1.el6 Build Date: Thu 03 Dec 2009 02:17:44 AM CET
Install Date: (not installed) Build Host: js20-bc1-11.build.redhat.com
Group : System Environment/Base Source RPM: crontabs-1.10-32.1.el6.src.rpm
Size : 2486 License: Public Domain and GPLv2
Signature : RSA/8, Wed 24 Feb 2010 08:46:13 PM CET, Key ID 938a80caf21541eb
Packager : Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>
Summary : Root crontab files used to schedule the execution of programs
Description :
The crontabs package contains root crontab files and directories.
You will need to install cron daemon to run the jobs from the crontabs.
The cron daemon such as cronie or fcron checks the crontab files to
see when particular commands are scheduled to be executed. If commands
are scheduled, it executes them.
Crontabs handles a basic system function, so it should be installed on
your system.
Perhaps you now want to see what files the crontabs RPM package installs. You would enter the following:
rpm -qlp crontabs-1.10-32.1.el6.noarch.rpm
The output is similar to the following:
/etc/cron.daily
/etc/cron.hourly
/etc/cron.monthly
/etc/cron.weekly
/etc/crontab
/usr/bin/run-parts
/usr/share/man/man4/crontabs.4.gz
