Batch (.bat) files Notes

% errorlevel% return value is operated on

HELP help command For more information about a command, type HELP command name

@ Echo shield, such as pause and there are differences @pause

@pause below ↓

pause below ↓

 

REG modify the registry

REG /? Help command

Redirect 1 > and >>

1> nul shielding correct output return

2> nul  shielded output error return 

This is normal output ↓

Let's use output redirection shield command:

Special note, this is the command I use in a .bat file for: 1> NUL 2> NUL REG the QUERY "HKCU \ Software"

Shown as REG the QUERY "HKCU \ Software" 1> NUL 2> NUL , because cmd will automatically rearrange the order of your command.

Not display output

 Reference blog: https://www.jianshu.com/p/dc15aad590d1

This article blog address: https://www.cnblogs.com/2018shawn/p/11106660.html