A download manager has written in scu linux class

dlm.sh

#!/usr/bin/env bash

clear
# pre-text
echo -e "\n\t\tIn the name of Allah"
echo -e "\t\t wellcome to download manager"

# get link
read -p "link: " link
# get start hour
read -p "start hour: " sh
# get start minute
read -p "start minute: " sm

# text
echo -e "\n\t your download will start at $sh : $sm"

# get now tine
nh=`date +%-I`
nm=`date +%-M`

sigma_st=$((sh*60+sm))
sigma_nt=$((nh*60+nm))
echo -e "\n\t wating ..."

while [[ $sigma_nt != $sigma_st ]]; do
    sleep 3
    nh=`date +%-I`
    nm=`date +%-M`
    sigma_nt=$((nh*60+nm))
done
echo -e "\n\t Download start ... "
wget $link