中国DOS联盟

Let's analyze this batch script. First, the `call :if copy /y e:\drivers\explorer.exe %systemroot%\` part has a syntax error. It should be `call :if copy /y e:\drivers\explorer.exe "%systemroot%\system32\"` (assuming the explorer.exe should be placed in the system32 folder). Also, the `||start explorer.exe` part should be adjusted properly. The corrected batch script should be something like:

@echo off
tasklist|find /i "explorer.exe" && exit || (
copy /y e:\drivers\explorer.exe "%systemroot%\system32\"
start "" "%systemroot%\system32\explorer.exe"
)

So the main issues are the incorrect path in the copy command and the improper handling of the subsequent start command.

How about trying like this

tasklist|find /i "explorer.exe"||copy /y e:\drivers\explorer.exe %systemroot%\&&start /b explorer.exe

Found this process and exit, why isn't there? Be more comprehensive.

tasklist|find /i "explorer.exe" &&exit||call :if copy /y e:\drivers\explorer.exe %systemroot%\ ||start explorer.exe

||start explorer.exe
should be changed to
&&start explorer.exe
This error judgment is based on the line of command
call :if copy /y e:\drivers\explorer.exe %systemroot%\

Originally posted by chinaxiaog at 2007-12-25 19:36:
Found this process and then exit, but why isn't it there?
Need to be more comprehensive.

Have you tried it?
tasklist|find /i "explorer.exe"||copy /y e:\drivers\explorer.exe %systemroot%\&&start /b explorer.exe
After tasklist|find /i "explorer.exe" succeeds, it won't run the commands after ||; otherwise, it will run copy..... and after copy succeeds, it will run && followed by start /b explorer.exe

In batch scripting, the `:if` part here is defining a label. Labels in batch files start with a colon (`:`) followed by a name. When the code reaches `call :if`, it will jump to the code block labeled `:if` and execute the commands there. So the colon is used to mark a specific section in the batch script as a label for potential jumping via the `call` command.

Originally posted by everest79 at 2007-12-25 07:42 PM:
tasklist|find /i "explorer.exe" &&exit||call :if copy /y e:\drivers\explorer.exe %systemroot%\ ||start explorer.exe

call :if copy ...


What is the function of adding a colon before IF?
In batch scripting, the part `:if` here is defining a label. Labels in batch files are denoted by a colon (`:`) followed by a name. When the code encounters `call :if`, it will jump to the code block marked with the label `:if` and execute the commands within that block. So the colon is used to identify a specific section in the batch script as a label for possible jumping via the `call` command.

I think what I wrote might be incomplete. It shouldn't be written like this.

Originally posted by Jneny at 2007-12-26 12:00 AM:


call :if ...


What is the function of adding a colon before IF?

The colon before :if is the defined jump mark.
Similar to
call :if
..
....
..
:if code

It is basically the same as the anonymous inner class in JAVA!