Bash variable inside another varaible

Looking to find out how to place a variable inside a variable.  The situation is this.  Every month a vulnerability scan is done using nessus and then exported to csv and I have a script to parse and clean out the know exceptions from the csv file.

Here is the initial script:

#### Variables
## Original Files
ORIG_FILE=File_090110_vulndata.csv
## Cleansed Files
NEW_FILE_CLEANSED=File_090110_vulndata_cleansed.csv
## Exceptions Files
NEW_FILE_EXCEPT=File_090110_vulndata_exceptions.csv

egrep -v "^.(40802|40803|40804|40805|42119|43875|44643|4550|44060|18405)" $ORIG_FILE > $NEW_FILE_CLEANSED

egrep "^.(Id|40802|40803|40804|40805|42119|43875|44643|4550|44060|18405)" $ORIG_FILE > $NEW_FILE_EXCEPT

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Now what I am trying to do is include a variable which would include the date and use this new variable inside the file name so that every month one would just have to change the date in one spot.  Using this example the script would look like this:

#### Variables
MDATE=090110
## Original Files
ORIG_FILE=File_$MDATE_vulndata.csv
## Cleansed Files
NEW_FILE_CLEANSED=File_$MDATE_vulndata_cleansed.csv
## Exceptions Files
NEW_FILE_EXCEPT=File_$MDATE_vulndata_exceptions.csv

egrep -v "^.(40802|40803|40804|40805|42119|43875|44643|4550|44060|18405)" $ORIG_FILE > $NEW_FILE_CLEANSED

egrep "^.(Id|40802|40803|40804|40805|42119|43875|44643|4550|44060|18405)" $ORIG_FILE > $NEW_FILE_EXCEPT

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However, this above code does not work and is the reason I am looking for assistance.
melodAsked:
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TintinConnect With a Mentor Commented:
Just needs braces

ORIG_FILE=File_${MDATE}_vulndata.csv
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melodAuthor Commented:
LOL... thanks I tried everything but braces....  Glad you picked it up so fast.  Easy points for you. Thank you!
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