install script improvements

scripts/install.sh

@@ -0,0 +1,48 @@
+#!/bin/sh
+
+# Function to check for required commands
+check_command() {
+    command -v "$1" >/dev/null 2>&1 || { echo >&2 "Error: $1 is required but not installed."; exit 1; }
+}
+
+# Check for required commands
+check_command curl
+check_command wget
+check_command sha256sum || check_command sha1sum
+
+# Set checksum command based on availability
+CHECKSUM_CMD=sha256sum
+if ! command -v $CHECKSUM_CMD >/dev/null 2>&1; then
+    CHECKSUM_CMD=sha1sum
+fi
+
+# Function to download and verify a file
+download_and_verify() {
+    URL=$1
+    EXPECTED_CHECKSUM=$2
+    TEMP_FILE=$(mktemp)
+
+    # Download the file
+    if command -v curl >/dev/null 2>&1; then
+        curl -L -o "$TEMP_FILE" "$URL"
+    else
+        wget -O "$TEMP_FILE" "$URL"
+    fi
+
+    # Verify the checksum
+    if [ "$($CHECKSUM_CMD "$TEMP_FILE" | awk '{print $1}')" != "$EXPECTED_CHECKSUM" ]; then
+        echo "Checksum verification failed!"
+        rm -f "$TEMP_FILE"
+        exit 1
+    fi
+
+    echo "Download and verification successful!"
+    # Continue with installation...
+}
+
+# Example usage
+download_and_verify "https://example.com/file" "expectedchecksumvalue"
+
+# Cleanup
+rm -f "$TEMP_FILE"
+echo "Installation completed successfully!"