When the command echo $$ outputs 12942, what is the meaning of 12942?
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A. B. C. D.B
The correct answer is B. It is the process ID of the current shell.
Explanation:
The command echo is used to display the value of a specified variable or string on the standard output. When we execute the command echo $$, it prints the process ID (PID) of the current shell.
A process ID is a unique identifier that is assigned to a process when it is created. Each process in a Linux system has a unique process ID. We can use the PID to perform various operations on a process such as sending signals, terminating it, etc.
In this case, the PID 12942 indicates that the current shell has been assigned this particular process ID. This information can be useful in various situations, such as when we need to kill a particular process or monitor the system for resource utilization.
Option A is incorrect because the echo command is a shell built-in command and does not create a separate process.
Option C is incorrect because echo $$ displays the process ID of the current shell, not the last command executed.
Option D is incorrect because echo $$ displays the process ID of the current shell, not the last command placed in the background.