How to read the first line user types into terminal in bash script

Question

I'm trying to write a script where to run the script, the user will type something along the lines of

$./cpc -c test1.txt backup

into the terminal, where ./cpc is to run the script, -c is $option, test1.txt is $source and backup is $destination.

How would I assign the values typed in to the terminal to use them in my script, for example in

if [[ -z $option || -z $source || -z $destination ]]; then
    echo "Error: Incorrect number of arguments." (etc)

as when checking the script online the following errors return: 'option/source/destination is referenced but not assigned.'

Sorry in advance if any of this doesn't make sense, I'm trying to be as clear as possible

Answer 1

The arguments are stored in the numbered parameters $1 , $2 , etc. So, just assign them

option=$1
source=$2
destination=$3

See also man getopt or getopts in man bash .