default value for a variable in bash script - bash

Question

I want to give my variable in bash script a default value.
Here is the script :
unamestr=`uname`
if [[ "$unamestr" == 'Linux' ]] || [[ "$unamestr" == 'Darwin' ]]; then
DEFAULT_LOCATION="/home/$USER/.kaggle/competitions/$1"
elif [[ "$unamestr" == 'CYGWIN' ]] || [[ "$unamestr" == 'MINGW' ]]; then
DEFAULT_LOCATION="C:\\Users\\$USER\\.kaggle\\competitions\\$1"
fi
kaggle competitions download -c $1
KAGGLE_LOCATION=${2:-DEFAULT_LOCATION}
mv KAGGLE_LOCATION .
mkdir data
mv $1/*.zip data/
mv $1/*.csv data/
cd data/
unzip *.zip
rm *.zip
When I do echo $DEFAULT_LOCATION, the correct value comes up. But when I do $KAGGLE_LOCATION and dont enter any cmd argument, I get DEFAULT_LOCATION as output instead of the actual value. What is wrong with my code?
PS: I have never used a Mac, so I am not sure if location is same for unix as Mac. If its different, please comment.

Answer 1

You are not expanding the variable, try expanding the variable like "$KAGGLE_LOCATION"
unamestr=`uname`
if [[ "$unamestr" == 'Linux' ]] || [[ "$unamestr" == 'Darwin' ]]; then
DEFAULT_LOCATION="/home/$USER/.kaggle/competitions/$1"
elif [[ "$unamestr" == 'CYGWIN' ]] || [[ "$unamestr" == 'MINGW' ]];then
DEFAULT_LOCATION="C:\\Users\\$USER\\.kaggle\\competitions\\$1"
fi
kaggle competitions download -c $1
KAGGLE_LOCATION=${2:-DEFAULT_LOCATION}
mv "$KAGGLE_LOCATION" .
mkdir data
mv $1/*.zip data/
mv $1/*.csv data/
cd data/
unzip *.zip
rm *.zip