如何使用Windows命令行将NUL写入文件夹中的所有日志文件

Question

I have multiple log files that start as ABC_.log in a windows environment. I want to clean that file (like writing /dev/null to file in linux). I need to do it through command line.

What I tried:

cmd:$ break > ABC_*.log

and

cmd:$ type NUL > ABC_*.log

Error:

 The filename, directory name, or volume label syntax is incorrect

Answer 1

this can't be done via wildcard (not possible to redirect to more than one file at a time). Use a for loop to process each file on it's own:

for %%a in (ABC_*.log) do (
  break>"%%a"
)

or directly on command line:

 for %a in (ABC_*.log) do  break>"%a"

Answer 2

The easiest way to empty a file in UNIX/Linux:

rm <filename>
touch <filename>