Ask for an example of the for command in the command prompt

for loop command, it will execute the same command multiple times as long as the conditions are met.

Syntax: Execute a specific command for each file in a set of files.

for %%variable in (set) do command [command-parameters]

variable specifies a single-letter replaceable parameter.

set) to specify a file or set of files. Wildcards can be used.

command specifies the command to be executed on each file.

command-parameters

Specify parameters or command-line switches for specific commands.

For example, there is a line in a batch file:

for %%c in (*bat *.txt) do type %%c

The command line displays the contents of all files with bat and txt extensions in the current directory.

If there are still questions.

My QQ

Or contact me for an email.

(Change @).

Or contact the bear ben user on bear ben'Genius Power works wonders.

Answer (Ben is welcome to tell me what I did wrong).

Some of the ones you said upstairs don't work, right?

rononce -p --15 seconds to shut down.

At least this one doesn't work very well.

Start--run-cmd is used to check your computer's memory, ip. and many other information.

DOS base commands.

cd change current directory sys make dos system disk copy copy file del delete file del delete file del delete directory tree dir column file name diskcopy edit text format create subdirectories mem view memory type show file contents rd delete directory ren change file name.

Your environment variable may be set incorrectly, look at the classpath setting, it should be set to the bin directory of the jdk.

The virtual machine is not installed, or environment variables are not set.

@echo off

if not exist "%1"(The size of the echo batch itself is %z0 bytes).

File size %z1 bytes).

pause>nul

Drag the file onto the bat file and you're good to go.

The tree method is quite difficult to implement, so you can see if the following method meets your requirements.

echo off

for /r e:\ i in (*do echo %%i %%zi

Bytes are units, and if you need to convert units, you can ask again.

Robocopy on Windows 7 presents a tree structure, but unfortunately this is used to copy the program instead of displaying, you can take a detailed look at the parameters, maybe you can use it.

You type help at the command prompt, and a list of all commands will appear.