fallocate:tldr:a7a1f

fallocate: Shrink 20 MB of space after 100 MiB in a file.

fallocate

$ fallocate --collapse-range --offset ${100M} --length ${20M} ${filename}

try on your machine

The command fallocate --collapse-range --offset ${100M} --length ${20M} ${filename} is used to allocate disk space and specify the offset and length for a specific file.

Here is the explanation of each part of the command:

fallocate: This is the command-line utility that is used to manipulate file space allocation on a Linux file system.
--collapse-range: This option is used to collapse file space ranges. It tries to merge allocated ranges that are adjacent to the specified offset and length parameters. This can help in optimizing file storage by reducing fragmentation.
--offset ${100M}: This parameter specifies the offset from the beginning of the file where you want to start allocating space. In this case, it is set to 100 megabytes.
--length ${20M}: This parameter specifies the length of the space to be allocated. The value is set to 20 megabytes in this case.
${filename}: This is the name of the file for which you want to allocate disk space. It should be replaced with the actual name of the file you are working with.

Overall, this command is useful for allocating a specific range of disk space for a file, allowing you to control the size and location of the allocated space.

This explanation was created by an AI. In most cases those are correct. But please always be careful and never run a command you are not sure if it is safe.

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