It is also a very useful tool for managing the coordination of services across the entire Linux kernel, both before and after re-compile of specific sections and functional areas. The SELinux command has increasingly been relied on for managing the ports active on smartphones and portable laptops that also have compatible Linux kernels installed on them (Greenemeier, 2005)
Analysis of the iptables Command The impetus of this command was the insight of Rusty Russell, a programmer who today works at IBM that the existing Linux kernel-based commands had significant security shortcomings. He observed that the firewall software in previous generation Linux operating systems had significant shortcomings, including support for just a handful of protocols including TCP/IP, UDP and ICMP, in addition to just having support for 32-bit operating system modules (MacVittie, 2005)
It also protected the entire file system for unwanted access and access across all system resources and programs as well., The developers of this command specifically looked at how to create a more effective strategy for managing user accounts and eradicating the threat of a single hacker gaining access to every user account on a Unix, and now Linux-based system (Rooney, 2004)
The salaries for positions vary by the difficult of the work being done, difficulty of replacing the person doing it, and the scope of experience a job candidate has (MacInnis, 2006). The future for those with UNIX programming and development skills is also being accelerated by the rapid adoption of Linux as the foundational operating systems of enterprises today, specifically in the areas of Enterprise Resource Planning (ERP) integration, transaction management and databases management and administration (de Brulin, Bos, Bal, 2011)
As a result of the pervasive adoption and widespread standardization on UNIX, the career opportunities are very significant. The salaries for positions vary by the difficult of the work being done, difficulty of replacing the person doing it, and the scope of experience a job candidate has (MacInnis, 2006)
The greater the depth of UNIX programming expertise on a brad array of database applications, the higher the potential salaries and greater the potential responsibility in an enterprise standardized on these technologies. The ability to quickly gain new skill sets and continually learn is essential for any UNIX developer to also progress in their career, as technological change occurs very fast in these positions and technical obsolescence is always a threat (Miller, 1986)
UNIX Marketability Requirements UNIX and Job Marketability, 2012 UNIX is the most-used operating system powering enterprise today, surpassing Microsoft Windows and all other operating systems combined. UNIX is also the foundation of the Linux operating systems, many variants of open source software, and is also in large part the theoretical foundation of the Google Android operating system (Sen, Singh, Borle, 2012)
IBM New UNIX Computer Over the past years, Sun has managed to take the lion's share of the market for servers running the UNIX operating system. By putting mainframe-style features such as partitioning into its servers, and building hardware for its own Solaris operating system, Sun managed to take the lead with their UNIX systems (Vance)
Microsoft designed Windows Services for UNIX to support 300 different UNIX commands including KornShell, C Shell and the common commands of awk and text editor vi for example. The high degree of modularity of the Microsoft Server system architecture is easily customizable yet also presents security risks as well (Hartley, 2008)
Comparing Kernels and Application Programmer Interface (API) The design of each operating systems' kernel is significantly different, varying on how each support I/O management, memory management, scheduling, power and thread management. One of the most significant differences between the kernels of these operating systems is how each define and use subsystems for completing application development while supporting deployment, delivering a high level of reliability at the system level (Janssens, Annot, van de Goor, 1986)
One of the most significant differences between the UNIX and Windows operating system architectures is that the former recompiles the system-level kernel at runtime. Database developers have favored the UNIX platform as a development environment as a result of this feature, as it makes the task of troubleshooting application development much more accurate and efficient (Son, Lee, Jeon, Chung, Lee, Lee, 2011)
The intent of this analysis is to evaluate the UNIX and Windows operating system architectures on the basis of differences in their kernel architectures, application programmer interfaces (API), security, approaches to process management. Both operating systems can support shell scripting, with this approach to process management and exception handling being more prevalent on the UNIX platform (Takeuchi, Nakayama, 2006)
The Microsoft hybrid kernel approach is also deliverable designed to allow for greater support of faster and more secured integration to 3rd party platforms through a wide variety of network protocols including TCP/IP. DHCP, XML and TELNET sessions as defined in UNIX shell scripts (Vellalacheruvu, Kumar, 2011)
Another variation in kernel architectural design that directly affects how customizable both operating systems are is the design philosophy with regard to monolithic vs. hybrid kernels (Zhou, Goscinski, 1997)