Though Linux was alotof likely used in enterprise environments afore RHEL , Red Hat Enterprise Linux was arguably the focussed Linux administration , providing release cycles and a akin of stability and abutment that had been accepted by enterprises . RHEL\'s was the admirable Red Hat Linux band , which was terminated at the end of 2003 . Though RHEL 3 is based on the 2 . 4 . x kernel , Red Hat aback ported a of key 2 . 6 features (including NPTL) into the RHEL 3 atom . RHEL is on a cable basis and has multiple layers of support (all the way up to 24/7) and ISV certifications . Through its source affirmation , Red Hat indemnifies its any abeyant absorb and apparent issues there may be with Linux . Red Hat in its various version and flavours has led Netcraft statistics for years as the most ascendant Linux distribution on the planet . Based on: RHEL is originally an of the now defunct Red Hat Linux , which itself in the (arguably adaptation 1) was based on Slackware . Though Red Hat has continued itself as its own defining . Kernel: 2 . 4 . x (with backported 2 . 6 appearance including NPTL) Window Manager: includes both GNOME (default) and KDE (optional) Package Manager: RPM
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