What does the "uname" command do?

What does the $ represent within the context of a shell command?

modprobe...

How do you redirect stderr to stdout?

To display contents of files on standard output, you could use the command:

How do you show all processes being run by a particular user?

When would this system cron job run its task? 0 1 \* \* \*

What command would you use to resize an LVM volume group to include an additional physical volume?

In a systemd-based OS, you can change the system hostname by editing /etc/hostname manually and then doing what?

When archiving files, which command will preserve all file attributes including ACLs and SELinux security context?

What character class is equal to this set? [0-9]