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The UNIX Operating System - Wiley - 1983 - Kaare Christian - GOOD$10.99
FreeBSD 2.0.5 UNIX Operating System Walnut Creek CDROM July 1995$185.00
UNIX and Linux System Administration Handbook Evi Nemeth$41.71
FreeBSD 15.0 Open Source UNIX OS Bootable USB | Live & Installer | UEFI & Legacy$19.99
Learning the UNIX Operating System, Fifth Edition Jerry Peek$10.26
Learning the UNIX Operating System, Fifth Edition$5.17
FreeBSD 4.5 UNIX OS Install CD Walnut Creek CDROM RARE VINTAGE$34.99
SCO Unix Operating System Version 4.2 Documentation with License No Software $99.99As an eBay Partner, userbars.org may earn a commission from qualifying purchases.