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truncate

Shrink or extend the size of a file to the specified size.

More information.

Set a size of 10 GB to an existing file, or create a new file with the specified size:

truncate --size {10G} {filename}

Extend the file size by 50 MiB, fill with holes (which reads as zero bytes):

truncate --size +{50M} {filename}

Shrink the file by 2 GiB, by removing data from the end of file:

truncate --size -{2G} {filename}

Empty the file's content:

truncate --size 0 {filename}

Empty the file's content, but do not create the file if it does not exist:

truncate --no-create --size 0 {filename}

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