built-in a linux

1. What is Linux builtin command?
2. How is Linux kernel built?
3. What is Makefile in Linux?
4. What is the use of KConfig?
5. What is a built in shell command?
6. How we can get list of shell built in commands in Linux?
7. Why is Linux written in C?
8. Is Linux a kernel or OS?
9. Is it legal to edit Linux kernel?
10. How do I run a Makefile in Unix?
11. What is difference between CMake and make?
12. How does Makefile work in Linux?

What is Linux builtin command?

A builtin command is a Linux/Unix command which is "built into a shell interpreter such as sh, ksh, bash, dash, csh etc". ... In other words we can say that these commands will always available in RAM so that accessing them is bit fast when compared to external commands which are stored on hard disk.

How is Linux kernel built?

The Linux kernel has a monolithic architecture, which means that the whole kernel code runs in kernel space and shares the same address space. ... Once a kernel module is loaded, it is part of the monolithic kernel and shares the same address space of the code that was included at kernel compile time.

What is Makefile in Linux?

A makefile is a special file, containing shell commands, that you create and name makefile (or Makefile depending upon the system). ... A makefile that works well in one shell may not execute properly in another shell. The makefile contains a list of rules. These rules tell the system what commands you want to be executed.

What is the use of KConfig?

KConfig is a selection-based configuration system originally developed for the Linux kernel. It is commonly used to select build-time options and to enable or disable features, and has now found use in other projects beyond the Linux kernel.

What is a built in shell command?

Builtin commands are contained within the shell itself. When the name of a builtin command is used as the first word of a simple command (see Simple Commands), the shell executes the command directly, without invoking another program.

How we can get list of shell built in commands in Linux?

You can use compgen -b from a bash shell to get a list of the shell's builtin commands.

Why is Linux written in C?

The UNIX operating system's development started in 1969, and its code was rewritten in C in 1972. The C language was actually created to move the UNIX kernel code from assembly to a higher level language, which would do the same tasks with fewer lines of code.

Is Linux a kernel or OS?

Linux, in its nature, is not an operating system; it's a Kernel. The Kernel is part of the operating system – And the most crucial. For it to be an OS, it is supplied with GNU software and other additions giving us the name GNU/Linux. Linus Torvalds made Linux open source in 1992, one year after it's creation.

Is it legal to edit Linux kernel?

It is absolutely legal to edit the source code for the linux kernel. The linux kernel is released as 'Open Source' and licensed in such a way as to encourage edits, code submissions, changes, bug fixes, etc. You can edit it however you like, to fit your environment.

How do I run a Makefile in Unix?

As paxdiablo said make -f pax.mk would execute the pax.mk makefile, if you directly execute it by typing ./pax.mk, then you would get syntax error. Also you can just type make if your file name is makefile/Makefile .

What is difference between CMake and make?

cmake is a system to generate make files based on the platform (i.e. CMake is cross platform) which you can then make using the generated makefiles. While make is you directly writing Makefile for a specific platform that you are working with. If your product is crossplatform, then cmake is a better choice over make .

How does Makefile work in Linux?

The make utility requires a file, Makefile (or makefile ), which defines set of tasks to be executed. You may have used make to compile a program from source code. Most open source projects use make to compile a final executable binary, which can then be installed using make install .