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No disk can hold an infinite amount of data. These commands report how much disk storage is in use or available, report other file and file status information, and write buffers to disk.
| • df invocation | Report file system disk space usage. | |
| • du invocation | Estimate file space usage. | |
| • stat invocation | Report file or file system status. | |
| • sync invocation | Synchronize cached writes to persistent storage. | |
| • truncate invocation | Shrink or extend the size of a file. |