BASH Script – Syntax error in expression

bash

I am running into an issue that I can't quite figure out. I have a BASH script which recurses through directories and compares the current date to the file-modified time of the file. If it is beyond a certain age, the file gets gzipped.
I am receiving the following error:

./serversync.sh: line 87: 1324308130-1323116622
1323581504: syntax error in expression (error token is "1323581504")

The section of code that is running at this point is cited below:

#If the file doesn't have a matching .gz file, compress it
                do if [ ! -e ${FILE}.gz ]
                        then
                                echo "Matching Gzip doesn't exist for $FILE"
                                echo Checking to see if compression needed
#test to make sure that the file is 30 days old, and if it is, gzip
                                FILEMTIME=$(stat -c %Y $FILE)
                                FILEAGE=$(($DATE-$FILEMTIME))
                                echo fileage is $FILEAGE
                                if [ $FILEAGE -gt $COMPRESSWINDOWSTART -a $FILEAGE -lt $COMPRESSWINDOWEND ]
                                        then
                                        echo $FILEAGE is greater than $COMPRESSWINDOWSTART and less than $COMPRESSWINDOWEND
                                        echo Compressing $FILE
                                        gzip $FILE
                                fi
                fi

Line 87 is this line:

                            FILEAGE=$(($DATE-$FILEMTIME))

If anyone can offer any ideas on why this happens id apprciate it!

Best Answer

try

FILEAGE=$DATE-$FILEMTIME

What you had was looking for a variable called "1324308130-1323116622" rather than trying to evaluate the expression.

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