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..).
md5sum – compute and check MD5 message digest
md5sum [OPTION] [FILE]…
md5sum [OPTION] –check [FILE]
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.