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fallocate

Reserve or deallocate disk space to files. The utility allocates space without zeroing. More information: https://manned.org/fallocate.

Reserve a file taking up 700 MiB of disk space:

fallocate --length {{700M}} {{path/to/file}}

Shrink an already allocated file by 200 MiB:

fallocate --collapse-range --length {{200M}} {{path/to/file}}

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

fallocate --collapse-range --offset {{100M}} --length {{20M}} {{path/to/file}}