Processes aren't "deleted", they are "killed." The "kill" command, followed by the process ID number, should kill the process. Most distros also have a "killall" command, which will kill processes that have the name you specified.
Innumerable. Remember that any program on Linux can be launched from the command line, so there are as many commands as there are programs.
It's a command to start the X server for running Linux in graphical mode, if you have any of the desktop environments and/or window managers installed.
To create a new user account under any Linux distribution use command called useradd. The system administrator is responsible for creating account. Login as root user (or use sudo command).
There is no "-n" command by default in linux, though it can be an option to other commands. For example, in the make(1) command, it can be used to suppress the make program from actually doing the actions specified - it just prints out what it would have done.Answer[-n] may be what is called a "switch" typically passed to a Unix or Linux command. As mentioned above, it modifies the actions of another command. For example, in the sort(1) command, it instructs sort to sort numerically instead of alphabetically. The meaning of any given switch will typically vary from command to command so read each man page carefully before using a switch. [JMH]
Any Linux/Unix process that runs in the background is called a 'daemon' process. The word derives from the Greek meaning "worker".
The fsck command can be used to repair improperly shut down or potentially corrupt partitions on Linux systems. It checks the file system integrity and attempts to repair any inconsistencies it finds.
There is no "the startup file" in Linux; depending on the type of system, there may not be any files at all. The Linux boot process has a number of steps, many of which are optional or have alternative implementations.
The 'kill' command sends a signal to a given process. By default without any options it will send the TERM (terminate) signal. Other options may include the KILL signal which forcbly terminates a process without waiting. As far as USR1 and USR2 signals it depends on the kind of application that is in said process.
For Unix, any command is run as a sub-process. You don't need an actual command to create the subprocess. You can also force the process to run in the background by appending a '&' symbol at the end of the command.
In what regard? People can teach themselves how to use Linux without any formal training. A company switching to Linux may wish to invest in training for their employees to speed up the process.
Anything can be made into a command on a Linux system. The steps are easy. First, using any text editor (vim, emacs, etc.) create a text file. Put anything you want to do in this file. Save the file. Make sure the file you just created has read and execute permissions (chmod). That's it! Now you have a command that you can execute in Linux.
As files can be of any number of types, there is no single command that will do this. You would use the program associated with that file type to create a file. If you wanted to create a "blank" file, that has no content and uses no space, use the command touch filename.