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Are you Mark G. Sobell, author of the books below?
A Practical Guide to Linux Commands, Editors, and Shell Progr... by Mark G. Sobell A Practical Guide to Ubuntu Linux by Mark G. Sobell A Practical Guide to Linux by Mark G. Sobell A Practical Guide to Red Hat Linux by Mark G. Sobell A Practical Guide to the UNIX System by Mark G. Sobell A Practical Guide to Solaris by Mark G. Sobell UNIX System V by Mark G. Sobell A Practical Guide to UNIX for Mac OS X Users by Peter Seebach Hands-On Unix by Mark G. Sobell A Practical Guide to Fedora and Red Hat Enterprise Linux by Mark G. Sobell


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