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}} Empty the file's content: truncate -s 0 {{filename}}