How does one view the ID of the current process in Linux?

How does one view the ID of the current process in Linux?

How does one view the ID of the current process in Linux?

$ Indicates the ID of the current process, and $ PPID indicates the ID of the parent process of the current process.

Bash-3.2 $ echo $
13750
Bash-3.2 $ echo $ PPID
13656
Bash-3.2 $ ps-ef | grep 13750
Oracle 13750 13656 0 00:00:00 pts/4 bash
Oracle 28981 13750 0 00:00:00 pts/4 ps-ef
Oracle 28982 13750 0 00:00:00 pts/4 grep 13750
The above result indicates that the parent process of ps (pid = 28981) and grep (pid = 28982) is bash (pid = 13750 ).

By the way, who is the parent process of bash? -Ksh: bash is run at the ksh prompt.
Bash-3.2 $ ps 13656
PID TTY STAT TIME COMMAND
13656 pts/4 S-ksh