kamyers1 said:
I posted a message here about 10 minutes ago regarding a bug in the FOR
command of cmd.exe. At first my message showed up, but now it is gone!
My
message included code for a few small batch programs to show examples of
the
apparent bug that I am running into. Are posts that include code deleted
from this forum...???
Here is a copy of your post which I found in Google Groups as mentioned by
Bennett Marco. Since this is far from a trivial set of batch files, you
should ask the batch file experts in alt.msdos.batch.nt for advice. They
love this type of challenge.
This is your post:
============
I wrote a couple of simple utilities using the FOR command in .bat files to
simplify string handling. These utilities 1) remove quotes, and 2) extract
the Nth word. They can both 1) process constant text from the command line,
2) process text output from another command entered on the command line, and
3) act as filters for text piped from another command.
Both of these utilities mostly work as intended. However, there is some
kind of problem that frequently results in printing a generally garbled
version of the message "The system cannot find the file". The message is
garbled in such a way as to strongly suggest that memory is somehow being
trashed.
These errors seem to usually (always?) result from using the FOR command
with the /F option to process contant text that has been enclosed in single
quotes, when the FOR command is NOT even being used to work with files. The
errors seem to occur *after* the FOR command has finished processing and is
terminating or cleaning up after itself.
I would appreciate if someone else could test these scripts to see if they
are able to duplicate the same errors that I see, and also to let me know if
you see anything that I am doing wrong. The content of my two scripts is
provided below, along with a simple test script that frequently produces the
error message. The test script runs in a continuous loop and must be
terminated using Ctrl-C when you are ready to quit.
temp.bat:
@echo off
rem Put this in the same folder as the other two files,
rem and run it from a command promp to test them.
rem Theoretically you should see three lines containing
rem "this is a test", followed by three lines with "is",
rem but you will probably also see some garbled
rem "The system cannot find the file" messages.
rem Hit Ctrl-c to exit when you have seen enough.
:start
echo "this is a test"|cmd /c dequote
call dequote /t "this is a test"
call dequote echo "this is a test"
echo.
echo this is a test|cmd /c scan 2
call scan 2 /t this is a test
call scan 2 echo this is a test
echo.
goto start
dequote.bat:
@echo off
:init
if '%1' equ '/?' goto help
if '%1' equ '-?' goto help
if /I '%1' equ '/h' goto help
if /I '%1' equ '-h' goto help
:main
if '%1' equ '' (
rem deQuote as a filter, could return multiple lines
rem for /f "tokens=* usebackq" %%s in (`NullFilter`) do echo %%~s
for /f "tokens=* usebackq" %%s in (`find /v "xyzzyx963852741"`) do
echo %%~s
) else (
if /I '%1' equ '/t' (
rem deQuote text from command line, always a single line
for /f "tokens=1,* usebackq" %%a in ('%*') do echo %%~b
) else (
rem deQuote output from specified command, could return
multiple lines
for /f "tokens=* usebackq" %%o in (`%*`) do echo %%~o
)
)
goto end
:help
echo deQuote.bat
echo Copyright (c) 2009-09-11 by Kevin A. Myers
echo All rights reserved.
echo.
echo Removes enclosing quotes from source text.
echo.
echo Syntax:
echo deQuote
echo deQuote /t <text>
echo deQuote <command>
echo.
:end
scan.bat:
@echo off
:init
if '%1' equ '/?' goto help
if '%1' equ '-?' goto help
if /I '%1' equ '/h' goto help
if /I '%1' equ '-h' goto help
:main
setlocal
if '%1' equ '' (set token=1) else (set token=%~1)
if '%delims%' neq '' set delims=delims=%delims%
if '%2' equ '' (
rem scan as a filter
rem for /f "tokens=%token% usebackq %delims%" %%s in (`NullFilter`)
do echo
%%s
for /f "tokens=%token% usebackq %delims%" %%s in (`find /v
"xyzzyx963852741"`) do echo %%s
) else (
if /I '%2' equ '/t' (
rem scan text from command line
for /f "tokens=2,* usebackq" %%a in ('%*') do (
for /f "tokens=%token% usebackq %delims%" %%t in
('%%b') do echo %%t
)
) else (
rem scan output from specified command
for /f "tokens=1,* usebackq" %%a in ('%*') do (
for /f "tokens=%token% usebackq %delims%" %%o in
(`%%b`) do echo %%o
)
)
)
endlocal
goto end
:help
echo scan.bat
echo Copyright (c) 2009-09-11 by Kevin A. Myers
echo All rights reserved.
echo.
echo Extract token(s) from specified input line(s).
echo Delimiters are taken from a delims environment variable.
echo.
echo Syntax:
echo scan
echo scan <token>
echo scan <token> /t <text>
echo scan <token> <command>
echo.
:end
