mkswap.sh

Makes a Swap File

#!/bin/bash

# Get the total memory in kilobytes
TOTAL_MEM_KB=$(grep MemTotal /proc/meminfo | awk '{print $2}')

# Calculate half of the total memory
HALF_MEM_KB=$((TOTAL_MEM_KB / 2))

# Convert kilobytes to megabytes (MB)
HALF_MEM_MB=$((HALF_MEM_KB / 1024))

# Define the swap file location
SWAPFILE=/swapfile

# Create a swap file with the calculated size
sudo fallocate -l "${HALF_MEM_MB}M" $SWAPFILE

# Set the correct permissions for the swap file
sudo chmod 600 $SWAPFILE

# Set up the swap area on the file
sudo mkswap $SWAPFILE

# Enable the swap file for usage
sudo swapon $SWAPFILE

# Add the swap file entry to /etc/fstab for persistent swap file usage
echo "$SWAPFILE none swap sw 0 0" | sudo tee -a /etc/fstab

# Display the new swap status
sudo swapon --show

# Display the current memory and swap usage
free -h