Shell Programming and Scripting

!/bin/bash
#
# Directory to back up
backup_dir="/home/directory/homeworkassign"

# Error-checking portion of script
if [ ! -d $backup_dir ]
then
echo "The specified backup directory $backup_dir does not exist."
echo "Operation canceled."
exit 1
fi

# Create filename for archive.
day=$(date +%Y%m%d)
hostname=$(athena.ecs.csus.edu -s)
archive_file="hostname-day$.tgz"

# Initiate backup sequence message
echo "Your folder is being backed up to $dest/$archive_file"

#!/bin/bash

 
hostname=$(athena.ecs.csus.edu -s)
to
hostname="athena.ecs.csus.edu -s"

archive_file="hostname-day$.tgz" ???????