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truncate

 
Shrink or extend the size of a file to the specified size. More information: https://www.gnu.org/software/coreutils/truncate.
 
  • 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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