When the command echo $ outputs 1, which of the following statements is true?
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A. B. C. D.C
When the command echo $ outputs 1, the following statement is true:
C. It is the exit value of the command executed immediately before echo.
Explanation:
The command echo $ is a shell command that prints the value of the shell variable $. The $$ is a special variable that holds the process ID (PID) of the current shell. However, in this case, we see that the output is 1, which means that it is not the PID of the current shell.
The exit value of a command is a value returned by a command to indicate its success or failure. In the case of echo $, the command executed immediately before it is the command to print the PID of the current shell, which is echo $$. Therefore, the output of echo $$ will be the PID of the current shell, and the exit value of that command will be 0 (indicating success).
The command echo $ does not have any command executed before it, so its exit value will be the exit value of the last executed command. Since the last executed command is echo $$, whose exit value is 0, the exit value of echo $ will also be 0.
Therefore, the statement "It is the exit value of the command executed immediately before echo" is true.