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truncate

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

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

truncate -s {{10G}} {{filename}}

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

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

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

truncate -s -{{2G}} {{filename}