When the command echo $ outputs 1, which of the following statements is true?
A.
It is the process ID of the echo command.
B.
It is the process ID of the current shell.
C.
It is the exit value of the command executed immediately before echo.
D.
It is the exit value of the echo command.
C is correct, but it is not echo $, it is echo $?
Regards
9
2
$$ PID of the current process.
$? return code of the last executed command.
$# number of arguments in $*
$* list of arguments passed to the current process
$! PID of last job running in background
0
1