Fill in the blank: Which directory in /dev/disk/ can be used to determine the UUID of a connected hard disk?

Fill in the blank: Which program lists information about files and network connections opened by processes? (Specify ONLY the command without any path or parameters.)

According to the Filesystem Hierarchy Standard (FHS), what is the path to the Linux kernel source and may be a symbolic link to the real Linux source code? (Please specify the full path with no version information.)

What keyword is missing in the following line from /etc/fstab in order to make a USB flash device writeable by the user fred when mounted: /dev/sda1 /mnt/usbflash vfat defaults,users,______=fred,umask=022, 0 0 (Provide the option name only without any settings)

After installing a compiled kernel, it can not find any modules that are needed to be loaded. What make target was likely missed while installing the kernel?