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Unix Review
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The newest certification available in the Unix/Linux world is that of Ubuntu Professional. Scheduled to become available worldwide through Pearson VUE and Prometric testing centers later this quarter, it debuted at LinuxWorld in Johannesburg, South Africa in May. The certification has been created through an alliance between Canonical, Ubuntu, and the Linux Professional Institute (LPI).
There are now hundreds of Linux distributions. User Mode Linux is not one of them. UML is an emulation of Linux on top of Linux. On the other hand, it is not a VM in the traditional sense — enabling the user to "fantasize" using an operating system while riding on a totally different one. Jeff Dike is the creator of UML and has been its maintainer since 1999. He not only knows it inside-out, he's able to explain it all.
Bash shell programmers can improve the efficiency of their scripts by using the shell's dynamically loadable built-in commands. This month, Chris F.A. Johnson shows us how to use them.
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