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I have a need to evaluate a batch script variable whose value will be something like this:
set cmd="set a=123&set b=456&c=xyz"
Here is my script:@echo off
set cmd="set a=123&set b=456&c=xyz"REM What do I do here to invoke the %cmd% variable as a command that will yeild me the three new environment variables a,b and c being set?
echo a=[%a%]
echo b=[%b%]
echo c=[%b%]So at the send, I would see echoed on the screen
a=[123]
b=[456]
c=[xyz]
Do you really need the quotes inside the value of cmd? If you leave out the quotes, you can just run the command using:
%cmd%
0 
By the way, if you don't have quotes in the set command, you'll have to escape the special characters such as &. So:
set cmd=set a=123^&set b=456^&set c=xyz
0
hey clint,
I observed without the double quotes, that this command:
set cmd=set a=123&set b=456&c=xyzshort-circuits %cmd% to have a value of: set a=123
where everything after the first "&" is gone!(Note I had an error in the original post as the c=xyz should be set c=xyz.)
So again, the general question is if the cmd variable has a value that is any number of chained set commands, each separated by the ampersand, how does one invoke that so that those chained set commands are executed?
0
See my second reply.
The problem is that the Command Processor takes & as a statement separator, so
set cmd=set a=123&set b=456&set c=xyzis interpreted as:
set cmd=set a=123 set b=456 set c=xyzBut if you use the escape character (^) before the & then you get the desired effect:
set cmd=set a=123^&set b=456^&set c=xyz echo "%cmd%"Gives: "set a=123&set b=456&set c=xyz"
and just entering %cmd% on a line makes it execute cmd.
0
I believe there is another way to achieve this without the escape character:
set "cmd=set a=123&set b=456&set c=xyz" %cmd%^^^ note the position of the first quote.
I can't test it at the moment because I don't have a working windows install(long story...), but I'm sure it works.
1
Besides the obvious, that using an existing command or reserved word for a varianle is uasually a bad idea, I used this:
set "var=set a=123&set b=456&set c=xyz"
and wound up with:
var=set a=123&set b=456&set c=xyz
a=123&set b=456&set c=xyzno b and no c
So I guess we're stuck escaping the &.
=====================================
Helping others achieve escape felicityM2
0
You guys are awesome thanks! We can consider this one solved.
But for another challenge, please checkout my other, bigger issue over here:
http://www.computing.net/answers/pr...
0
Did Judago's reply in that thread get you going?
=====================================
Helping others achieve escape felicityM2
0
No because my problem is not simply a matter of knowing there was an error, I really need the actual value.
for /F "usebackq delims=€" %%G in (`"%JAVA_CMD%"`) do (
if ERRORLEVEL 1 (
REM ---> I need the actual value here...1, 2, 3, etc...set into _rc
)
set _stdout=%%G
)
0
What's in %JAVA_CMD%" ?
=====================================
Helping others achieve escape felicityM2
0
Hi M2,
I had a vague thought about the reserved var %cmd% but couldn't quite remember(haven't been bothered to install + call india yet...).
Good catch!
Hi Klint,
I was pretty sure it would, just been tripped up too many times....
@tvattima
Well there are a couple of ways to achieve this (the link to the how to in my sig explains in much more detail).
In most cases all you will have to do is:
setlocal enabledelayedexpansion for /F "usebackq delims=€" %%G in (`"%JAVA_CMD%"`) do ( rem do your thing with !errorlevel! set _stdout=%%G )Just be aware that !'s will dissapear from your output, if they are important there is a couple of ways to get around that too...
0
M2,
I just re-read your post and noticed:
"I used this:
set "var=set a=123&set b=456&set c=xyz"
and wound up with:
var=set a=123&set b=456&set c=xyz
a=123&set b=456&set c=xyzno b and no c
So I guess we're stuck escaping the &.
I haven't seen this behaviour before, perhaps the quote trick was introduced with xp or something, I guess it may be one of those things to watch out for with win2k.
0
"haven't been bothered to install + call india yet"
I better stand up; they're goin' over my head.
I had a real queasy feeling about the backq and the mystery delim so I wrote this:
===============================
for /F "tokens=* delims= " %%G in ('chkdsk d:') do (
echo !ERRORLEVEL!
set _stdout=%%G
)
set > newfile
===========================
Which spits out zeros and sets:_stdout=77,431 allocation units available on disk.
which is just what I'd expect.
If I wanted a var set to the exit code I would:
===========================
chkdsk z:
echo !ERRORLEVEL!
set _stdout=!ERRORLEVEL!
set > newfile
========================
I get:_stdout=3
because I don't HAVE a z: drive.
=====================================
Helping others achieve escape felicityM2
0
Ok folks, I'm going back to revisit this with the !ERRORLEVEL! approach!
Stay tuned. Appreciate all the expertise flying around here!
0
Hi Judago,
Yeah, could be a 2k/XP gotcha.
Here's the crc for w2k SP4 cmd.exe
4E0D158A
=======================
tvattima,Changing from % to ! didn't help. Getting it out of the for loop did.
=====================================
Helping others achieve escape felicityM2
0
I better stand up; they're goin' over my head.
I'm at slight disadvantage today I must admit. I had a motherboard die and am running ubuntu at the moment. That means no testing.
I normally run xp: dead mobo = Re-install/repair windows + call india(via ms) to tell some guy to transfer my retail windows license to new hardware :(
I should probably just bow out but I think this forum is addictive or something.....
0
LOL I don't do license xfer.
=====================================
Helping others achieve escape felicityM2
0
@M2: What's wrong with using cmd as a variable name? Where is it reserved? On Windows XP and Vista, there is no reserved variable by the name of CMD.
0
Hi klint,
I respect your ability and don't want to start a debate.
I can't count the times some noob has, for instance, created a bat to ftp and cleverly named it ftp.bat then couldn't figure out why it blew up.
=====================================
Helping others achieve escape felicityM2
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