07-09-2009
what are you trying to do with usermod? If you are trying to make Bob part of the admin group you have it backwards
Also, your usernames should, for conventional sake, be lowercase
Also, usermod -G will change the secondary group, so the GID (Group Identifier) for the user never changes.
If you run the "id" command on your user you will see the UID, GID and the groups they are a member of.
As for CentOS you can use yum, the built in downloader/software manager to handle most of what you need. Also look at pirut for doing most of what you want with the packages. It should be installed.
Think of the way Linux distributions manage software now as packages of information that rely on other packages of information. They now use repositories, kind of like a personal "Amazon.com" if you will. Say you want to install xyzfoo.rpm you can do that with yum on CentOS 5 and if xyzfoo.rpm needs abcdoodad.rpm it will grab both, download them, install them and update its own library to show that they are both there.
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LEARN ABOUT CENTOS
yum-verify
yum-verify(1) yum-verify(1)
NAME
yum verify plugin
SYNOPSIS
yum [options] verify [package ...]
DESCRIPTION
This plugin extends yum with some commands that give verification information on the installed system, much like rpm -V. You can change how
the verification is done and which files it applies to.
added yum commands are:
* verify
* verify-rpm
* verify-all
all of which take the same arguments as the list yum command, obviously you can only verify packages that are installed on the system.
verify Is the generic verification command, and is intended to give the most useful output. It removes all false matches due to multilib
and ignores changes to configuration files by default.
verify-rpm
Is meant to be 100% compatible with rpm -V output, and any differences should be considered as bugs.
verify-all
Is used to list all the differences, including some that rpm itself will ignore.
GENERAL OPTIONS
These are the options added to yum that are available in the verify commands. They are:
--verify-filenames
This option is used to limit the filenames that the packages will perform verification.
--verify-configuration-files
This option is only useful in the generic verify command, and will enable/disable verification of files that are tagged as configu-
ration files.
EXAMPLES
To do the same as rpm -Va, use:
yum verify-rpm
To verify the packages starting with the name yum, use:
yum verify 'yum*'
To verify the binaries that are in a bin directory, use:
yum verify --verify-filenames='*bin/*'
To verify all include files, Eg. for multilib problems, use:
yum verify-all --verify-filenames='/usr/include/*'
SEE ALSO
yum (8)
yum.conf (5)
the verify.conf file in /etc/yum/plugins.d
AUTHORS
James Antill <james.antill@redhat.com>.
BUGS
Currently yum-verify does not do verify-script checking or dependency checking,
only file checking.
Should you find any other bugs, you should first
consult the FAQ section on http://yum.baseurl.org/wiki/Faq and if unsuccessful
in finding a resolution contact the mailing list: yum-devel@lists.baseurl.org.
To file a bug use http://bugzilla.redhat.com for Fedora/RHEL/Centos
related bugs and http://yum.baseurl.org/report for all other bugs.
James Antill 01 March 2008 yum-verify(1)