What is the unit for
Available? And what does
1K-blocks mean? Does it mean that the size is in kB?
df -k | head -2
Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda7 9920592 1054440 8354084 12% /
Display values are in units of the first available SIZE from --block-size, and the DF_BLOCK_SIZE, BLOCK_SIZE and BLOCKSIZE environment variables. Otherwise, units default to 1024 bytes (or 512 if POSIXLY_CORRECT is set).
SIZE may be (or may be an integer optionally followed by) one of following: KB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T, P, E, Z, Y.
-k switch is equal to
--block-size=1K, which means that the numbers are in multiples of 1024 bytes.
Yes, you are right, as the doc says:
-k Use 1024-byte (1-Kbyte) blocks, rather than the default. Note that this overrides the BLOCKSIZE specification from the environ- ment.