How Full Is That Partition?
To get an idea how much free space remains on your partitions, use df(1). This program displays the total number of filesystem blocks on each partition, how many blocks are in use, and how many blocks are free. It also gives you the percent in use.
One annoying thing about df is that it offers this information in 512-byte blocks by default. This was fine when disks were much smaller, but today, it’s like measuring the distance of an airplane flight in yards. Some people have done this for so long that they automatically perform block transformations in the back of their mind.[19] For the rest of us, the -h flag tells df to provide human-readable output, such as megabytes or gigabytes, giving us something like this: ...
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