Fill in the blank.
What command ensures that the file systems are written to disk after a lot of write operations? (Specify ONLY the command without any path or parameters.)

Consider the following output from df -i:
Filesystem Inodes IUsed IFree IUse% Mounted on
/dev/md0 1966080 45044 1921036 3% /
none 125731 712 125019 1% /dev
none 127729 1 127728 1% /dev/shm
none 127729 17 127712 1% /var/run
none 127729 2 127727 1% /var/lock
none 1966080 45044 1921036 3% /var/lib/ureadahead/debugfs
/dev/sde1 0 0 0 - /mnt
What filesystem does /dev/sde1 most likely use?

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?

What command will remove the physical volume /dev/sda4 from the volume group /dev/vg0?
(Provide the command with options and parameters)

The user' quotas on the server were reduced from 200MB to 100MB. Besides sending emails to all users, it was requested that a message should communicate the change every time a user access the server. Which of the following is the correct method to configure this?