Which command(s) can be used to view the list of tasks running from the current shell instance?

Which directory stores process information? 

What UIDs correspond to daemons and pseudo-users usually?

You can get information about the processes using the command

Which variable stores the exit code of the last executed command, function, or script?

Which of the following answers indicates the stable version of the kernel?

What is the nice value for the highest process priority?

When you need a pipeline (|)?

In order to refresh information about list of repositories (Ubuntu)

Which UID could be usually used for a daemon/pseudouser in Linux?