From the command-line you can empty a file without opening an editor and removing all the lines. This can be useful when you have a bulky log file you don’t need to keep for example.
truncate command you can shrink the file to a specified size. If you specify a size of
0 you effectively end up with an empty file. This even works when the file is currently being written to.
$ truncate -s 0 huge.log
A second option is to use the output redirection operator(
>). You use the output redirection operator to write standard output to a file, and overwrite the file if it already exists.
$ > huge.log