There are dozens of shells for Linux. The most popular are:
bash (Bourne-Again Shell)
ksh (Korn shell)
zsh (Z Shell)
ash (Almquist shell)
dash (Debian Almquist shell)
BusyBox (based on ash)
fish (Friendly Interactive Shell)
You can have as many compiled kernels in your Linux installation as you want (disk space is your limit). However, you can only boot one kernel at a time.
Yes! You can Run OSX (mac) and linux at the same time with a virtual machine. I perfer Parallels.
Any Linux-based operating system that is capable of multitasking. (I.E. doing more than one thing at the same time.)
The original UNIX was an operating system developed by Bell Labs in the early 70's. What makes UNIX significant is that many of the ideas that were part of it became standards in computers, even today. As time passed, those standards evolved, and became the basis for a number of newer systems, such as BSD, Linux, and even Mac OS X. Since they share similar standards they are called "UNIX variants". In 1992, Linux was created. What makes Linux different from many of the other UNIX variants is that no one owns Linux, and it is essentially "community property". It has been freely adapted for many purposes. Linux "distributions" are versions of Linux that are tailored for a specific audience. Since no one person's needs are exactly the same, there are many different versions to choose from. They are the same operating system, just with different things added.
You need to take it to a qualified gunsmith.
This is entirely dependent on how the system is used. Most desktop Linux systems are likely to have one user on at a time. Servers are more likely to have several on at a time, however.
A multiprocessor OS. Mac OS, Windows, and Linux all currently support this(as well as many others).
The Linux kernel was originally written by Linus Torvalds (Linux is only one letter away from Linus) Over time most of the Linux kernel has been modified by many people in the open source community, however Linus still oversees the project.
No. Windows and Linux have different APIs and ABIs for programs to access. You cannot run Linux binaries on Windows, and you can only run Windows binaries on Linux if you have Wine installed.
in a linux machine : tar -cvf FileOrDirectory.tar FileOrDirectory # or to gzip it at the same time... tar -czvf FileOrDirectory.tgz FileOrDirectory
There are an abundant amount of securities in Linux, and most Linux distributions. It would take an extremely long time to list out every "Security" in Linux, as it's built around securities.
There are a range of versions of Linux - part of it's appeal is that it can be used for a wide range of computers, from phones to supercomputers. Linux is based on the Unix operating system; both can offer real time, multitasking, multiuser, lightweight and flexible systems - although not necessarily all of these at the same time.