add util to get memory stats

pom.xml

@@ -373,6 +373,13 @@ cobbzilla-utils is available under the Apache License, version 2: http://www.apa
             <version>1.64</version>
         </dependency>
 
+        <!-- https://mvnrepository.com/artifact/com.github.oshi/oshi-core -->
+        <dependency>
+            <groupId>com.github.oshi</groupId>
+            <artifactId>oshi-core</artifactId>
+            <version>5.2.4</version>
+        </dependency>
+
     </dependencies>
 
     <build>

src/main/java/org/cobbzilla/util/system/CommandShell.java

@@ -6,6 +6,8 @@ import org.apache.commons.exec.*;
 import org.apache.commons.io.output.TeeOutputStream;
 import org.cobbzilla.util.collection.MapBuilder;
 import org.cobbzilla.util.io.FileUtil;
+import oshi.SystemInfo;
+import oshi.hardware.HardwareAbstractionLayer;
 
 import java.io.*;
 import java.util.*;
@@ -27,6 +29,8 @@ public class CommandShell {
     public static final String CHOWN = "chown";
 
     private static final int[] DEFAULT_EXIT_VALUES = {0};
+    public static final SystemInfo SYSTEM_INFO = new SystemInfo();
+    public static final HardwareAbstractionLayer HARDWARE = SYSTEM_INFO.getHardware();
 
     public static Map<String, String> loadShellExports (String path) throws IOException {
         if (!path.startsWith("/")) {
@@ -254,6 +258,8 @@ public class CommandShell {
         }
     }
 
+    public static final long totalSystemMemory() { return HARDWARE.getMemory().getTotal(); }
+
     public static String hostname () { return toString("hostname"); }
     public static String domainname() { return toString("hostname -d"); }
     public static String hostname_short() { return toString("hostname -s"); }