diff --git a/src/main/java/com/sumsec/core/ast/util/DotHandler.java b/src/main/java/com/sumsec/core/ast/util/DotHandler.java
index a9d8abb..5c98ea1 100644
--- a/src/main/java/com/sumsec/core/ast/util/DotHandler.java
+++ b/src/main/java/com/sumsec/core/ast/util/DotHandler.java
@@ -33,23 +33,37 @@ public String[] RunCmd(String[] dotPath){
         String[] cmd;
         mkdir(ConstatField.ResultTemp);
         ArrayList<String> imgPaths = new ArrayList<>();
-//        String path = ConstatField.ResultTemp + ConstatField.separator + name + ".png";
+
         for (int i = 0; i < dotPath.length; i++) {
             String imgPath = ConstatField.ASTResultTemp + ConstatField.separator + dotPath[i].substring(dotPath[i].lastIndexOf("\\") + 1, dotPath[i].lastIndexOf(".")) + ".png";
+
             if (isWindowsOS) {
                 //windows下的命令
                 cmd = new String[]{"cmd.exe", "/c", "dot", "-Tpng", dotPath[i], "-o", imgPath};
             } else {
                 //linux下的命令
-                cmd = new String[]{"/bin/sh", "-c", "dot", "-Tpng" , dotPath[i] , "-o", imgPath};
+
+                // fix #issue2
+                // on unix use / instead \
+                // has tow slash in imgPath
+                imgPath = ConstatField.ASTResultTemp + ConstatField.separator + dotPath[i].substring(dotPath[i].lastIndexOf("/") + 1, dotPath[i].lastIndexOf(".")) + ".png";
+                // fixme: use `/usr/bash -c` may has problem in some bash such as zsh
+                cmd = new String[]{"dot", "-Tpng" , dotPath[i] , "-o", imgPath};
             }
             try {
-
                 logger.info("开始生成图片 " + dotPath[i]);
                 logger.info("正在执行命令 "+ Arrays.toString(cmd));
                 sleep(1000);
                 String charsetName = isWindowsOS ? "GBK" : "UTF-8";
-                byte[] bytes = new Scanner(Runtime.getRuntime().exec(cmd).getInputStream(), charsetName).useDelimiter("\\A").next().getBytes(charsetName);
+                Runtime.getRuntime().exec(cmd);
+
+                byte[] bytes = null;
+                Scanner runCmd = new Scanner(Runtime.getRuntime().exec(cmd).getInputStream(), charsetName).useDelimiter("\\A");
+                //fix issue#2 : on linux ,detect hasNext otherwise will throw an NoSuchElementException
+                if (runCmd.hasNext())
+                    bytes = runCmd.next().getBytes(charsetName);
+
+
                 File file = new File(imgPath);
                 if (!file.exists()) {
                     logger.info("bytes.length = " + bytes.length);
diff --git a/src/main/java/com/sumsec/core/cfg/Generate.java b/src/main/java/com/sumsec/core/cfg/Generate.java
index 94a25ea..927e629 100644
--- a/src/main/java/com/sumsec/core/cfg/Generate.java
+++ b/src/main/java/com/sumsec/core/cfg/Generate.java
@@ -18,6 +18,7 @@
 
 import java.io.File;
 import java.util.ArrayList;
+import java.util.Collections;
 
 import static cn.hutool.core.io.FileUtil.mkdir;
 import static soot.SootClass.SIGNATURES;
@@ -56,6 +57,7 @@ public boolean DotG(String graphtype,String filename){
                 Options.v().set_prepend_classpath(true);
                 Options.v().set_allow_phantom_refs(true);
                 Options.v().set_soot_classpath(ConstatField.CFGHOMETemp);
+
             }
 
             if (filename.endsWith(".class")){
diff --git a/src/main/java/com/sumsec/core/cfg/core/CFGViewerOver.java b/src/main/java/com/sumsec/core/cfg/core/CFGViewerOver.java
index 45869be..a2849c9 100644
--- a/src/main/java/com/sumsec/core/cfg/core/CFGViewerOver.java
+++ b/src/main/java/com/sumsec/core/cfg/core/CFGViewerOver.java
@@ -33,6 +33,8 @@ public static Object parse_options(CFGViewer viewer,String[] args) {
     public static void main(CFGViewer viewer,String[] args) {
         Object obj = parse_options(viewer, args);
         Scene.v().addBasicClass(args[0], SIGNATURES);
+
+
         System.out.println(args[0]);
         ConstatField.main.run((String[]) obj);
     }
@@ -43,6 +45,7 @@ public static CFGViewer CFGViewerOver(){
         Transform printTransform = new Transform("jtp.printcfg", viewer);
         printTransform.setDeclaredOptions("enabled alt-class-path graph-type ir multipages brief ");
         printTransform.setDefaultOptions("enabled alt-class-path: graph-type:BriefUnitGraph ir:jimple multipages:false  brief:false ");
+
         PackManager.v().getPack("jtp").add(printTransform);
 
 
diff --git a/src/main/java/com/sumsec/core/cfg/uitls/GenClass.java b/src/main/java/com/sumsec/core/cfg/uitls/GenClass.java
index 55830aa..1ddf2c3 100644
--- a/src/main/java/com/sumsec/core/cfg/uitls/GenClass.java
+++ b/src/main/java/com/sumsec/core/cfg/uitls/GenClass.java
@@ -32,7 +32,7 @@ public static void genClassM(String mName,String mContext){
             log.info("开始生成class： " + className);
             byte[] bytes = clzz.toBytecode();
 //            ByteArrayOutputStream baos = new ByteArrayOutputStream();
-            String file = ConstatField.CFGHOMETemp ;
+            String file = ConstatField.CFGHOMETemp;
             mkdir(file);
             FileOutputStream fos = new FileOutputStream(file + ConstatField.separator + className + ".class");
             fos.write(bytes);
diff --git a/src/main/java/com/sumsec/core/cfg/uitls/OSUtil.java b/src/main/java/com/sumsec/core/cfg/uitls/OSUtil.java
index 018c9af..c11eae8 100644
--- a/src/main/java/com/sumsec/core/cfg/uitls/OSUtil.java
+++ b/src/main/java/com/sumsec/core/cfg/uitls/OSUtil.java
@@ -39,7 +39,7 @@ public String[] RunCmd(String[] dotPath){
         String[] cmd;
         mkdir(ConstatField.ResultTemp);
         ArrayList<String> imgPaths = new ArrayList<>();
-//        String path = ConstatField.ResultTemp + ConstatField.separator + name + ".png";
+
         logger.info(dotPath.length);
         for (int i = 0; i < dotPath.length; i++) {
             String imgPath = ConstatField.ResultTemp + ConstatField.separator + dotPath[i].substring(dotPath[i].lastIndexOf("\\") + 1, dotPath[i].lastIndexOf(".")) + ".png";
@@ -48,7 +48,9 @@ public String[] RunCmd(String[] dotPath){
                 cmd = new String[]{"cmd.exe", "/c", "dot", "-Tpng", dotPath[i], "-o", imgPath};
             } else {
                 //linux下的命令
-                cmd = new String[]{"/bin/sh", "-c", "dot", "-Tpng" , dotPath[i] ,"-o", imgPath};
+                // fix #issue2
+                imgPath = ConstatField.ResultTemp + ConstatField.separator + dotPath[i].substring(dotPath[i].lastIndexOf("/") + 1, dotPath[i].lastIndexOf(".")) + ".png";
+                cmd = new String[]{"dot", "-Tpng" , dotPath[i] ,"-o", imgPath};
             }
             try {
 
@@ -56,7 +58,14 @@ public String[] RunCmd(String[] dotPath){
                 logger.info("正在执行命令 " + Arrays.toString(cmd));
                 sleep(1000);
                 String charsetName = isWindowsOS ? "GBK" : "UTF-8";
-                byte[] bytes = new Scanner(Runtime.getRuntime().exec(cmd).getInputStream(), charsetName).useDelimiter("\\A").next().getBytes(charsetName);
+
+                byte[] bytes = null;
+                Scanner runCmd = new Scanner(Runtime.getRuntime().exec(cmd).getInputStream(), charsetName).useDelimiter("\\A");
+                // fix #issue2: on linux : detect hasNext otherwise will throw an NoSuchElementException
+                if (runCmd.hasNext())
+                    bytes = runCmd.next().getBytes(charsetName);
+
+
                 File file = new File(imgPath);
                 if (!file.exists()) {
                     logger.info("bytes.length = " + bytes.length);