make swapfile easily with this simple script

mkswap.sh

#!/bin/sh
MEMSIZE=$(free -m | awk 'NR==2{print $2}')
if [ $MEMSIZE -gt 4096 ]; then
    RECMEMSIZE=$MEMSIZE
else
    RECMEMSIZE=$(($MEMSIZE*2))
fi

echo "enabling all swap partitions & files"

swapon -a
SWAPSIZE=$(free -m | awk 'NR==3{print $2}')

if [ $SWAPSIZE != 0 ]; then
    echo "You already have "$SWAPSIZE"mb swap memory."
fi

while true; do
    read -p "I'll create "$RECMEMSIZE"mb swapfile in root directory. DO U ACCEPT?  (y/n)?" choice
    case $choice in
    
        [Yy]* ) echo "dd..."; dd if=/dev/zero of=/swapfile bs=512 count=$(($RECMEMSIZE*1024)); chown root:root /swapfile; chmod 0600 /swapfile; echo "mkswap..."; mkswap /swapfile; swapon /swapfile; echo "/swapfile none swap sw 0 0" >> /etc/fstab; break;;
        
        [Nn]* ) echo "U JUST WASTED MY TIME BRO :/"; exit;;
        
        * ) echo "say yes(y) or no(n).";;
        
    esac
done