Linux - disk free command (df)
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Example
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
17G 16G 0 100% /
/dev/sda1 99M 12M 82M 13% /boot
tmpfs 1.5G 0 1.5G 0% /dev/shm
Difference between du and df
du shows the space by file whereas df shows the space by block of file.
<WRAP tip round> If there is a big difference in their output, try to see if some deleted file are not held by a process as open.
Example with linux and lsof
lsof /device | grep -i deleted
If this is the case, you need to restart the process to reclaim this buffers. </note>