In one of my scripts, I need to use variables that contain parenthesis inside IF
statements, but either the string is missing a closing parenthesis or the script ex
First off - you should never use the PATH variable for your own use. It is a reserved environment variable. Using it for your own purposes can break your scripts.
The simplest solution really is to use delayed expansion. As long as your platform uses CMD.EXE then you have access to delayed expansion.
But there is a relatively easy way to make it work without delayed expansion. You can use disappearing quotes. The quote exists at parse time as the name of a FOR variable while the command is parsed. It expands to nothing before execution time.
@echo off
SET mypath=%programFiles(x86)%
echo Perfect output: %mypath%
IF NOT "%mypath%" == "" (
REM Variable is defined
for %%^" in ("") do echo fixed output: %%~"%mypath%%%~"
)
pause >nul
EDIT - When to use delayed expansion: Response to comment
I generally only use delayed expansion when it is needed (or more precisely, when it is advantageous). That being said, I usually find it advantageous in some portion of my batch code.
Major Advantages
echo !%1!
echo !var:%search%=%replace%!
, echo !var:%start%,%len%!
.set "var=A&B" & echo !var!
There are other methods to do the above (except the last), but delayed expansion is the easiest, most efficient (fastest to execute), and most reliable option.
Major Disadvantage
!
in its value will be corrupted when it is expanded if delayed expansion is enabled. I frequently toggle delayed expansion on and off within a FOR loop to get around the problem.As others already pointed out, the unescaped and unquoted closing parenthesis )
unintentionally ends the parenthesised if
block.
Besides escaping, quotation, delayed expansion and "disappearing quotes", there are the following further options:
Use a for meta-variable on the quoted value and remove the quotes by the ~-modifier:
@echo off
set "PATH=%ProgramFiles(x86)%"
echo Perfect output: %PATH%
if not "%PATH%" == "" (
rem Variable is defined
for %%P in ("%PATH%") do echo Unbroken output: %%~P
)
pause > nul
Use the call command to initiate another variable expansion phase, together with doubled (escaped) %
-symbols:
@echo off
set "PATH=%ProgramFiles(x86)%"
echo Perfect output: %PATH%
if not "%PATH%" == "" (
rem Variable is defined
call echo Unbroken output: %%PATH%%
)
pause > nul
Do escaping by sub-string substitution, which happens before ^-escaping is detected:
@echo off
set "PATH=%ProgramFiles(x86)%"
echo Perfect output: %PATH%
if not "%PATH%" == "" (
rem Variable is defined
echo Unbroken output: %PATH:)=^)%
)
pause > nul
my suggestion is :
if (condition_TRUE) goto goodbye_parenthesis_BEGIN
goto goodbye_parenthesis_END ----- line when previous condition is FALSE ----
:goodbye_parenthesis_BEGIN ----- line when previous condition is TRUE ----
...
variable treatment
...
:goodbye_parenthesis_END
The )
from the resolved variable in your echo
statement is prematurely closing the IF
block.
Ordinarily, you could fix that by escaping the )
with ^)
, but you can't modify the environment variable to resolve to C:\Program Files (x86^)
.
You can prevent this issue by surrounding the variable with quotes.
As a simpler example:
> SET bad=a)b
> IF 1 == 1 ( ECHO %bad% )
b was unexpected at this time.
> IF 1 == 1 ( ECHO "%bad%" )
"a)b"
Forgive me if I'm reading this wrong, but isn't the "NOT" causing control to enter the bracketed if and run the broken output?
what about:
@echo off
echo Perfect output: %programFiles(x86)%
IF NOT "%programFiles(x86^)%" == "" (
REM Variable is defined
echo Broken output: %programFiles(x86)%
)
pause >nul
?