~/Test $ truncate --help
BusyBox v1.37.0.git (2023-08-01 12:16:57 UTC)
Usage: truncate [-c] -s SIZE FILE...
Truncate FILEs to SIZE
-c Do not create files
-s SIZE
~/Test $ truncate -s -64 testFile.bin
truncate: invalid number '-64'
From man pages:
SIZE may also be prefixed by one of the following modifying characters: ‘+’ extend by, ‘-’ reduce by, ‘<’ at most, ‘>’ at least, ‘/’ round down to multiple of, ‘%’ round up to multiple of.
From man pages: