Question

Inside a Bash shell script, you can access the PID of the script using which of the following environment variables?

A) $PID
B) $PROCESS_ID
C) $SCRIPT_PID
D) $$

Answer 1

option D) $$, In Bash shell scripting, the $$ environment variable is used to access the PID of the script's executing process.

Step-by-step explanation:

In a Bash shell script, you can access the PID (Process ID) of the currently running script using the $$ environment variable. The $$ gives you the process ID of the script's executing process. For example, using echo $$ inside your script will output the PID of the shell script to the terminal.

The correct option to access the PID (Process ID) of a Bash shell script from within the script itself is D) $$. The special variable $$ in Bash represents the PID of the current process. By using $$ within the script, you can retrieve and manipulate the unique identifier assigned to the running script, facilitating tasks such as logging, process management, or creating temporary files with unique names. This variable simplifies referencing and tracking the script's process ID dynamically, enhancing script functionality and control within the Bash environment.