/**
 * Shared sysctl parser utility.
 * Extracts a single sysctl key value from multi-line `sysctl -a` output.
 */
/**
 * Extract the value for a given sysctl key from command output.
 * Returns null if the key is not found.
 *
 * @example
 * extractSysctlValue("net.ipv4.tcp_syncookies = 1", "net.ipv4.tcp_syncookies") // "1"
 */
export declare function extractSysctlValue(output: string, key: string): string | null;
//# sourceMappingURL=sysctl.d.ts.map