Batch Script Optimization

Question

I am working on some batch script with following code block:

echo off echo SETTING UP ANT FOR THE BUILD .... set ANT_HOME=%~dp0%build\apache-ant-1.8.2 set ANT_BIN=%~dp0%build\apache-ant-1.8.2\bin SET path=%path%;%ANT_BIN%;%ANT_BIN%; echo PATH: %path% echo ANT_HOME: %ANT_HOME% echo ANT_BIN: %ANT_BIN% echo ANT GOT INSTALLED ....

It help me to set up my path to my ant path in environment variable.

Now, each time i run this bat file it goes for setting up the environment variable for ant.

I have to put some condition that if path is already there then just skip the setup option else setup option begins.

How can we do this using bat script? As i am new to bat script i tried with following code block:

IF "%ANT_HOME%" == "" GOTO NOPATH :YESPATH ...

:NOPATH ...

but the problem here is i am not able to get how to check the case for following: The %ANT_HOME% is not blank but have some invalid ant directory path.

Can anyone help me out here ?

possible duplicate of How to verify if a file exists in a Windows .BAT file? — sashoalm
– sashoalm, Commented May 30, 2013 at 6:18

Endoro · Accepted Answer · 2013-05-30 06:35:57Z

you have an error in your script:

SET path=%path%;%ANT_BIN%;%ANT_BIN%;

this should be:

SET "path=%path%;%ANT_HOME%;%ANT_BIN%"

if you want to check for a not existing path you should place a backslash at the end. Otherwise this is also true, if a file with this name exists:

if exist "%ANT_HOME%\" (echo %ANT_HOME% found.) else echo Error: %ANT_HOME% not found!

Community · Accepted Answer · 2017-05-23 12:05:24Z

You can use IF EXIST to check if a file exists. Adapted from this answer:

if exist "%ANT_HOME%" ( rem file exists ) else ( rem file doesn't exist )

Stephan · Accepted Answer · 2013-05-30 06:31:49Z

to avoid, adding your entries multiple times to the path, you should check this.

set path | find "%ANT_HOME%;%ANT_BIN%"

will give you %errorlevel% of '0' when it is already appended,or '1' when not.

Anyway: %path% is removed at the end of a cmd session, if not stored in the registry.

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