deleting lines in a file

I have created a menu and I am trying to create a script that deletes lines (records) from a file (asg51fin) . when d|D is selected dethe script should prompt for the name and delete the entire line from the file. this is the code I have thus far but it does not work. I keep getting the following error message. -d:: unknown test operator d|D echo "Enter the last name of the record to be deleted: \c" read $lastname if [ cut -d: -f1 asg51fin > delete ] ; then [ grep -v '$lastname' delete asg51fin ] echo "Record was deleted" else echo "Record was not found" fi ;;

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