China DOS Union

Purpose: Modify or add the system path environment variable. If there is c:\123 in the environment variable, delete it. If there is no %System32%\qqq, add that path.

I used regedit /e or reg export in batch to export the HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Session Manager\Environment key in the registry, but the exported path is in the following hexadecimal number form and has multiple lines:
"ComSpec"=hex(2):25......
"Path"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,\
00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,3b,00,25,00,\
53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,3b,00,25,\ .........
"FP_NO_HOST_CHECK"="NO"
"OS"="Windows_NT"
"PROCESSOR_ARCHITECTURE"="x86"
........

Asking experts:
1. How to only keep the path key in the exported registry key (keep multiple lines completely)
2. How to modify the existing path and add a new path

Note: The path obtained by set path in cmd is all absolute paths, not relative paths in the registry. I want to get relative paths, and absolute paths seem unable to be imported into the registry to change the path value.

[ Last edited by HAT on 2008-10-22 at 09:48 ]

The content queried by REG QUERY is not in hexadecimal.
You might as well use REG QUERY to query, and save the queried content into a file (redirect or use For),
Isn't this an existing ASCII code? Why must you have that hexadecimal encoded registry content? Haha...

path=%path%;D:\My_Path

Originally posted by electronixtar at 2006-11-26 01:34:
path=%path%;D:\My_Path

Hehe, I also add this to autoexec.bat

Originally posted by electronixtar at 2006-11-26 01:34 AM:
path=%path%;D:\My_Path

Brothers on floor 4 and floor 5, you think too simply. After you run your batch file, take a look at the system's path environment variable. The added path is not saved at all, it's only effective within your batch file. Think it over carefully

Modifying environment variables generally requires making changes in the registry. Since I'm not familiar with this either, I can only get it to this point. Please, experts in the registry step in and offer strong assistance.

Originally posted by mylovelyqq at 2006-11-26 04:40:


Brothers on the 4th and 5th floors, you think too simply. After you run your batch file, take a look at the system's path environment variable. The added path is not saved at all, it's only effective within your batch file...

>>c:\autoexec.bat echo path %path%;c:\tools

I use it like this all the time

### Adding System Environment Variables:

The values of environment variables need to be entered manually. The ones imported into the registry should be permanent. I don't know how many characters the system environment variables can hold. If it can hold relatively few, it might not be imported successfully. Hehe, I don't know either.
```
@echo off&setlocal enabledelayedexpansion
:begin
cls
set/p path_=Please enter the path of the environment variable you want to add:
if not defined path_ goto error
for,/f,"skip=4 tokens=1,2,*",%%a,in,('reg query "HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Session Manager\Environment" /v Path'),do,(
echo The current environment variable is:
echo %%c
echo;
set/p yesno=Do you confirm to add "%path_%" to the system environment variable? /
if /i "!yesno!"=="y" (
reg add "HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Session Manager\Environment" /v Path /t REG_EXPAND_SZ /d "%%c;%path_%" /f
)
goto :eof
)
pause
goto :Eof
:error
echo Input error, please enter again
pause
goto begin
```

I'm not very familiar with the for command, but I used a small tool called strrpc 1.0 to perform text replacement on the value exported by reg query .../v Path, and it still achieved the goal.

Brother redtek is always so enthusiastic, heh heh...
I'm here to post some water

Writing to autoexec.bat is completely okay~ At least my test in 03 was good

Originally posted by mylovelyqq at 2006-11-29 08:18:
Thanks to redtek for providing setx, which can run under XP. I haven't had time to use it much yet.
The small tool strrpc I use to replace text is also very useful. I'll upload it tomorrow.

Also re vkill
Modifying the system's autoexec.bat...

Brother often modifies the path??? I usually set two paths and never worry about it again. I think it's okay. Hehe~ Personal preference