How can I find out how much free space is available on disk?

Q

How can I find out how much free space is available on disk?

✍: Guest

A

There is no portable way. Under some versions of Unix you can call statfs. Under MS-DOS, use interrupt 0x21 subfunction 0x36, or perhaps a routine such as diskfree. Another possibility is to use popen to invoke and read the output of a ``disk free'' command (df on Unix).
(Note that the amount of free space apparently available on a disk may not match the size of the largest file you can store, for all sorts of reasons.)

2015-04-03, 1134👍, 0💬