How to check free disk space
 

fdisk -l shows u your partitions' names
how about to know the free space available?

df -h /path/to/dir

That requires you to know where your partitions are mounted. A look at /etc/fstab will set things straight if you have trouble remembering.

df -h

With no options will give you free space of all mounted drives---no need to worry about fstab or remembering.

If you have QTParted (GUI partitioning software) it'll give you the details about every partition.

-A

df on its own does the same thing without any flags.

Yep, but the h flag makes it easier to read. The h is for human-readable, after all.

To clarify my point, on most Linux distros running "df -h" and "df" results in the same output (human-readable form usually in gigabytes), so its not necessary to use "df -h" unless you want to.

Really? I've never seen that before in 4 years of using linux.
Are you sure you don't have a bash alias for df?

Nope, I have not setup any aliases but this could have been done by the distro.

Thank you. df -h is suitable.