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DESCRIPTION top. fallocate is used to manipulate the allocated disk space for a file, either to deallocate or preallocate it. For filesystems which support the fallocate system call, preallocation is done quickly by allocating blocks and marking them as uninitialized, requiring no IO to the data blocks.
What is fallocate command?
The “fallocate” command is probably one of the lesser known commands that can be used within Linux to create a file. fallocate is used to preallocate blocks to a file. … This is a much faster method of creating a file rather than filling it with zeros.
How do I create a dummy file in Linux?
Linux / UNIX: Create Large 1GB Binary Image File With dd Command
- fallocate command – Preallocate space to a file.
- truncate command – Shrink or extend the size of a file to the specified size.
- dd command – Convert and copy a file i.e. clone/create/overwrite images.
- df command – Show free disk space.
