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Creating secure tmp

I think it may helpful with you:

Step 1: Securing /tmp
Step 1.1: Backup your fstab file

cp /etc/fstab /etc/fstab.bak
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Clean up old kernels

This is quick guide howto delete/remove/clean old kernels on Fedora, CentOS, Red Hat (RHEL). I use here two kernel as example, if you want to keep other more or less, then adjust amount of installed kernels as you wish. Normally reason why you maybe want remove kernels is limited disk space, example on VPS servers and laptop. This is very easy task, you need yum-utils package.
Check Installed Kernels
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TinyProxy Web Proxy

TinyProxy is a light and very fast proxy. It doesn’t do cache as Squid, but consumes only 2MB of memory: perfect for small local networks.
Link: https://www.banu.com/tinyproxy/

Installation

yum install tinyproxy

Configuration
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Squid Web Proxy

The Squid Web Proxy Cache is a fully featured Internet caching server that handles all types of web requests on behalf of a user. When a user requests a web resource (webpage, movie clip, graphic, etc..), their request is sent to the caching server which then forwards the request to the real web server on their behalf. When the requested resource is returned to the caching server, it stores a copy of the resource in its “cache” and then forwards the request back to the original user. The next time someone requests a copy of the “cached” resource, it is delivered directly from the local proxy server and not from the distant web server (depending on age of resource etc..).
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Linux Unix Command md5sum

Command Library
NAME
md5sum – compute and check MD5 message digest
SYNOPSIS
md5sum [OPTION] [FILE]…
md5sum [OPTION] –check [FILE]
DESCRIPTION
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Installing Compressed Files

This question comes up frequently on the Linux_Newbies list. There are various commands that work, so if you’ve heard something different, and it works well for you, then use it. There are variations of commands that one person, such as myself, uses more out of habit than anything else.

RPMS are packages compressed using the RedHat Package Manager (ergo, R P M). Both KDE and Gnome have graphic interfaces for installing RPMS, however, some folks seem to have difficulty using them and of course, one feels more like a Linux ace if they install via command line.
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