Using truncate to clear log files on UBUNTU

How to clear log files on UBUNTU?

command:

truncate -s 0 /var/log/*log

the command means let log file's size = 0

truncate --helpUsage: truncate OPTION... FILE...Shrink or extend the size of each FILE to the specified size
A FILE argument that does not exist is created.
If a FILE is larger than the specified size, the extra data is lost.If a FILE is shorter, it is extended and the extended part (hole)reads as zero bytes.
Mandatory arguments to long options are mandatory for short options too.  -c, --no-create        do not create any files  -o, --io-blocks        treat SIZE as number of IO blocks instead of bytes  -r, --reference=RFILE  base size on RFILE  -s, --size=SIZE        set or adjust the file size by SIZE bytes      --help     display this help and exit      --version  output version information and exit
The SIZE argument is an integer and optional unit (example: 10K is 10*1024).Units are K,M,G,T,P,E,Z,Y (powers of 1024) or KB,MB,... (powers of 1000).
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.
GNU coreutils online help: <https://www.gnu.org/software/coreutils/>Full documentation at: <https://www.gnu.org/software/coreutils/truncate>or available locally via: info '(coreutils) truncate invocation'