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for a change you might want to look at mail, home direcotry files and other things before and after change
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for a change you might want to look at mail, home direcotry files and other things before and after change

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if &nbsp;You want to simply change the uid for user &nbsp;use <br />
<br />
# usermod -u &lt;new uid&gt; username
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if  You want to simply change the uid for user  use

# usermod -u <new uid> username

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Once you change the UID of a regular user, that user will cease to own his home dir and files within. As root you can fix this:-<br />
<br />
# usermod -u &lt;new uid&gt; username<br />
<br />
# chown -R username: ~username<br />
<br />
The colon after username changes the group of the user's files to his default group - miss it out if you're not planning to change that. To make sure you're going to work on the rigt directory, yo can &quot;echo ~username&quot; first - that should echo the path of the user's home dir.<br />
<br />
If you are changing the UID of a system user (mailer or whatever), follow the advice posted earlier (find command &amp;c)
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Once you change the UID of a regular user, that user will cease to own his home dir and files within. As root you can fix this:-

# usermod -u <new uid> username

# chown -R username: ~username

The colon after username changes the group of the user's files to his default group - miss it out if you're not planning to change that. To make sure you're going to work on the rigt directory, yo can "echo ~username" first - that should echo the path of the user's home dir.

If you are changing the UID of a system user (mailer or whatever), follow the advice posted earlier (find command &c)

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<div class="content wysiwyg-content">
Due to some requirements, I need to change some users account UID. <br />
I need to know what are the necessary/relevant changes that need to be made once the UIDs are changed. And also how do they related to processes and file permissions and to the applications &amp;&nbsp;DBs running on the systems.<br />
<br />
Bottomline is I do not want to change something which I am not aware of the consequences.
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Due to some requirements, I need to change some users account UID. 
I need to know what are the necessary/relevant changes that need to be made once the UIDs are changed. And also how do they related to processes and file permissions and to the applications & DBs running on the systems.

Bottomline is I do not want to change something which I am not aware of the consequences.

change UID for accounts in Linux (Redhat)

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.

Linux

A Linux distribution is an operating system made as a software collection based on the Linux kernel and, often, on a package management system and are available for a variety of systems. A typical Linux distribution comprises a Linux kernel, GNU tools and libraries, additional software, documentation, a window system (the most common being the X Window System), a window manager, and a desktop environment. Most Linux systems are open-source software made available both as compiled binaries and in source code form, allowing modifications to the original software. Over three hundred distributions are in active development, including commercially backed distributions (such as Fedora, openSUSE and Ubuntu) and community-driven distributions (such as Debian, Slackware, Gentoo and Arch Linux).