Shrink or extend the size of a file to the specified size.
# To set a size of 10 GB to an existing file, or create a new file with the specified size:
truncate --size <10G> <filename>
# To extend the file size by 50M, fill with holes (which reads as zero bytes):
truncate --size +<50M> <filename>
# To shrink the file by 2GiB, by removing data from the end of file:
truncate --size -<2G> <filename>
# To empty the file's content:
truncate --size 0 <filename>
# To empty the file's content, but do not create the file if it does not exist:
truncate --no-create --size 0 <filename>