mjhjmtu

I have this script that assigns name of the second argument to the environment variable that is specified in first command line argument. I got stuck at assigning and exporting the environment variable:

# assigns first argument to environmentVariable variable
environmentVariable=$1
# assigns second argument to new_path variable
newPath=$2
# calls function locate_field to check if new_path exists in environmentVariable
locate_field $environmentVariable $newPath
# gets return value from locate_field
returnCode=$?
# environment variable is not empty
if [[ "$returnCode" -eq 0 ]]; then
 #adds new path and exporting the environment variable
 export $environmentVariable=$(eval echo '$'$environmentVariable):$newPath
# environment variable is empty
elif [[ "$returnCode" -eq 2 ]]; then
 #adds new path and exporting the environment variable
 export $environmentVariable=$newPath
else
 echo "$newPath already exists in the environment variable."
fi

How can I fix the the export statements on both conditions to make it work? Here is the locate_field() function.

function locate_field()
 #parameters passed to the function
 envVariable=$(eval echo '$'$1)
 pathToBeAdded=$2
 #flag variable found
 found=0
 #when given environment variable value is empty
 list_length=$#envVariable
 if [[ "$list_length" -eq 0 ]]; then
 found=2
 fi
 old_value=IFS
 IFS=:
 for each_path in $envVariable
 do
 if [[ "$each_path" == "$pathToBeAdded" ]]; then
 found=1
 fi
 done
 IFS=$old_value
 echo $found
 return $found