cheat:truncate
# To clear the contents from <file>:
truncate -s 0 <file>
# To truncate <file> to 100 bytes:
truncate -s 100 <file>
# To truncate <file> to 100 KB:
truncate -s 100K <file>
# (M, G, T, P, E, Z, and Y may be used in place of "K" as required.)
tldr:truncate
# 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
$
cheat.sh