diff --git a/lib/index.js b/lib/index.js
index 8fadb97..f27aaea 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -72,8 +72,11 @@ class Aws {
             };
             //console.log('exec options =', execOptions);
             //console.log('options.cliPath =', this.options.cliPath);
+            let cmd = [...command.split(' ')];
+            cmd = cmd.filter(v => v.length > 0);
+            //console.log('cmd2 = ', cmd);      
             return new Promise((resolve, reject) => {
-                execFile(this.options.cliPath, [...command.split(' ')], execOptions, (error, stdout, stderr) => {
+                execFile(this.options.cliPath, cmd, execOptions, (error, stdout, stderr) => {
                     if (error) {
                         const message = `error: '${error}' stdout = '${stdout}' stderr = '${stderr}'`;
                         //console.error(message);
diff --git a/lib/index.js.map b/lib/index.js.map
index 3d74709..c54e083 100644
--- a/lib/index.js.map
+++ b/lib/index.js.map
@@ -1 +1 @@
-{"version":3,"file":"index.js","sourceRoot":"","sources":["../src/index.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;;;;AAAA,4DAAiC;AACjC,6DAA+C;AAC/C,MAAM,QAAQ,GAAG,aAAa,CAAC,QAAQ,CAAC;AAGxC,MAAM,aAAa,GAAG,CAAC,MAAc,EAAU,EAAE;IAC/C,IAAI;QACF,MAAM,CAAC,MAAM,GAAG,IAAI,CAAC,KAAK,CAAC,MAAM,CAAC,GAAG,CAAC,CAAC;KACxC;IAAC,OAAO,CAAC,EAAE;QACV,MAAM,CAAC,MAAM,GAAG,CAAC,CAAC;KACnB;IACD,OAAO,MAAM,CAAC;AAChB,CAAC,CAAC;AAEF,MAAa,GAAG;IAEd,YAAoB,UAAoB;QACtC,SAAS,EAAE,SAAS;QACpB,uBAAuB,EAAE,SAAS;QAClC,SAAS,EAAE,SAAS;QACpB,OAAO,EAAE,KAAK;KACf;QALmB,YAAO,GAAP,OAAO,CAK1B;IAAI,CAAC;IAEC,OAAO,CAAC,OAAe,EAAE,QAAwC;QAGtE,MAAM,OAAO,GAAG,OAAO,CAAC,OAAO,EAAE,CAAC,IAAI,CAAE,GAAG,EAAE;YAG3C,MAAM,QAAQ,GAAG,CAAC,oDAAoD;gBACpE,uCAAuC;gBACvC,qCAAqC,CAAC,CAAC,KAAK,CAAC,GAAG,CAAC,CAAC;YAGpD,MAAM,GAAG,GAAG,QAAQ,CAAC,MAAM,CAAC,CAAC,MAAW,EAAE,KAAa,EAAE,EAAE;gBACzD,IAAI,OAAO,CAAC,GAAG,CAAC,KAAK,CAAC,EAAE;oBACtB,MAAM,CAAC,KAAK,CAAC,GAAG,OAAO,CAAC,GAAG,CAAC,KAAK,CAAC,CAAC;iBACpC;gBACD,OAAO,MAAM,CAAC;YAChB,CAAC,EAAC,EAAE,CAAC,CAAC;YAEN,GAAG,CAAC,OAAO,CAAC,GAAG,EAAE,CAAC;YAElB,IAAI,IAAI,CAAC,OAAO,CAAC,SAAS,EAAE;gBAC1B,GAAG,CAAC,mBAAmB,CAAC,GAAG,IAAI,CAAC,OAAO,CAAC,SAAS,CAAC;aACnD;YAED,IAAI,IAAI,CAAC,OAAO,CAAC,SAAS,EAAE;gBAC1B,GAAG,CAAC,uBAAuB,CAAC,GAAG,IAAI,CAAC,OAAO,CAAC,SAAS,CAAC;aACvD;YAED,IAAI,IAAI,CAAC,OAAO,CAAC,YAAY,EAAE;gBAC7B,GAAG,CAAC,mBAAmB,CAAC,GAAG,IAAI,CAAC,OAAO,CAAC,YAAY,CAAC;aACtD;YAED,MAAM,WAAW,GAAG;gBAClB,GAAG,EAAE,IAAI,CAAC,OAAO,CAAC,uBAAuB;gBACzC,GAAG,EAAE,GAAG;gBACR,SAAS,EAAE,GAAG,GAAG,IAAI,GAAG,IAAI;aAC7B,CAAC;YAEF,6CAA6C;YAC7C,yDAAyD;YACzD,OAAO,IAAI,OAAO,CAAsC,CAAC,OAAO,EAAE,MAAM,EAAE,EAAE;gBAC1E,QAAQ,CAAC,IAAI,CAAC,OAAO,CAAC,OAAO,EAAE,CAAC,GAAG,OAAO,CAAC,KAAK,CAAC,GAAG,CAAC,CAAC,EAAE,WAAW,EAAE,CAAC,KAAmB,EAAE,MAAc,EAAE,MAAc,EAAE,EAAE;oBAC3H,IAAI,KAAK,EAAE;wBACT,MAAM,OAAO,GAAG,WAAW,KAAK,eAAe,MAAM,eAAe,MAAM,GAAG,CAAC;wBAC9E,yBAAyB;wBACzB,MAAM,CAAC,OAAO,CAAC,CAAC;qBACjB;oBACD,mCAAmC;oBACnC,OAAO,CAAC,EAAE,MAAM,EAAE,MAAM,EAAE,MAAM,EAAE,MAAM,EAAE,CAAC,CAAC;gBAC9C,CAAC,CAAC,CAAC;YACL,CAAC,CAAC,CAAC;QACL,CAAC,CAAC,CAAC,IAAI,CAAC,CAAC,IAAwC,EAAE,EAAE;YAEnD,MAAM,MAAM,GAAW;gBACrB,OAAO;gBACP,KAAK,EAAE,IAAI,CAAC,MAAM;gBAClB,MAAM,EAAE,IAAI;gBACZ,GAAG,EAAE,IAAI,CAAC,MAAM;aACjB,CAAC;YACF,OAAO,aAAa,CAAC,MAAM,CAAC,CAAC;QAC/B,CAAC,CAAC,CAAC;QAEH,OAAO,oBAAO,CAAC,OAAO,EAAE,QAAQ,CAAC,CAAC;IACpC,CAAC;CACF;AAzED,kBAyEC;AAkBD,MAAa,OAAO;IAClB,YACS,SAAkB,EAClB,SAAkB,EAClB,YAAqB,EACrB,uBAAgC,EAChC,UAAU,KAAK;QAJf,cAAS,GAAT,SAAS,CAAS;QAClB,cAAS,GAAT,SAAS,CAAS;QAClB,iBAAY,GAAZ,YAAY,CAAS;QACrB,4BAAuB,GAAvB,uBAAuB,CAAS;QAChC,YAAO,GAAP,OAAO,CAAQ;IAAI,CAAC;CAC9B;AAPD,0BAOC"}
\ No newline at end of file
+{"version":3,"file":"index.js","sourceRoot":"","sources":["../src/index.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;;;;;AAAA,4DAAiC;AACjC,6DAA+C;AAC/C,MAAM,QAAQ,GAAG,aAAa,CAAC,QAAQ,CAAC;AAGxC,MAAM,aAAa,GAAG,CAAC,MAAc,EAAU,EAAE;IAC/C,IAAI;QACF,MAAM,CAAC,MAAM,GAAG,IAAI,CAAC,KAAK,CAAC,MAAM,CAAC,GAAG,CAAC,CAAC;KACxC;IAAC,OAAO,CAAC,EAAE;QACV,MAAM,CAAC,MAAM,GAAG,CAAC,CAAC;KACnB;IACD,OAAO,MAAM,CAAC;AAChB,CAAC,CAAC;AAEF,MAAa,GAAG;IAEd,YAAoB,UAAoB;QACtC,SAAS,EAAE,SAAS;QACpB,uBAAuB,EAAE,SAAS;QAClC,SAAS,EAAE,SAAS;QACpB,OAAO,EAAE,KAAK;KACf;QALmB,YAAO,GAAP,OAAO,CAK1B;IAAI,CAAC;IAEC,OAAO,CAAC,OAAe,EAAE,QAAwC;QAGtE,MAAM,OAAO,GAAG,OAAO,CAAC,OAAO,EAAE,CAAC,IAAI,CAAE,GAAG,EAAE;YAG3C,MAAM,QAAQ,GAAG,CAAC,oDAAoD;gBACpE,uCAAuC;gBACvC,qCAAqC,CAAC,CAAC,KAAK,CAAC,GAAG,CAAC,CAAC;YAGpD,MAAM,GAAG,GAAG,QAAQ,CAAC,MAAM,CAAC,CAAC,MAAW,EAAE,KAAa,EAAE,EAAE;gBACzD,IAAI,OAAO,CAAC,GAAG,CAAC,KAAK,CAAC,EAAE;oBACtB,MAAM,CAAC,KAAK,CAAC,GAAG,OAAO,CAAC,GAAG,CAAC,KAAK,CAAC,CAAC;iBACpC;gBACD,OAAO,MAAM,CAAC;YAChB,CAAC,EAAC,EAAE,CAAC,CAAC;YAEN,GAAG,CAAC,OAAO,CAAC,GAAG,EAAE,CAAC;YAElB,IAAI,IAAI,CAAC,OAAO,CAAC,SAAS,EAAE;gBAC1B,GAAG,CAAC,mBAAmB,CAAC,GAAG,IAAI,CAAC,OAAO,CAAC,SAAS,CAAC;aACnD;YAED,IAAI,IAAI,CAAC,OAAO,CAAC,SAAS,EAAE;gBAC1B,GAAG,CAAC,uBAAuB,CAAC,GAAG,IAAI,CAAC,OAAO,CAAC,SAAS,CAAC;aACvD;YAED,IAAI,IAAI,CAAC,OAAO,CAAC,YAAY,EAAE;gBAC7B,GAAG,CAAC,mBAAmB,CAAC,GAAG,IAAI,CAAC,OAAO,CAAC,YAAY,CAAC;aACtD;YAED,MAAM,WAAW,GAAG;gBAClB,GAAG,EAAE,IAAI,CAAC,OAAO,CAAC,uBAAuB;gBACzC,GAAG,EAAE,GAAG;gBACR,SAAS,EAAE,GAAG,GAAG,IAAI,GAAG,IAAI;aAC7B,CAAC;YAEF,6CAA6C;YAC7C,yDAAyD;YACzD,IAAI,GAAG,GAAG,CAAC,GAAG,OAAO,CAAC,KAAK,CAAC,GAAG,CAAC,CAAC,CAAC;YAClC,GAAG,GAAG,GAAG,CAAC,MAAM,CAAC,CAAC,CAAC,EAAE,CAAC,CAAC,CAAC,MAAM,GAAG,CAAC,CAAC,CAAC;YACpC,oCAAoC;YAEpC,OAAO,IAAI,OAAO,CAAsC,CAAC,OAAO,EAAE,MAAM,EAAE,EAAE;gBAC1E,QAAQ,CAAC,IAAI,CAAC,OAAO,CAAC,OAAO,EAAE,GAAG,EAAE,WAAW,EAAE,CAAC,KAAmB,EAAE,MAAc,EAAE,MAAc,EAAE,EAAE;oBACvG,IAAI,KAAK,EAAE;wBACT,MAAM,OAAO,GAAG,WAAW,KAAK,eAAe,MAAM,eAAe,MAAM,GAAG,CAAC;wBAC9E,yBAAyB;wBACzB,MAAM,CAAC,OAAO,CAAC,CAAC;qBACjB;oBACD,mCAAmC;oBACnC,OAAO,CAAC,EAAE,MAAM,EAAE,MAAM,EAAE,MAAM,EAAE,MAAM,EAAE,CAAC,CAAC;gBAC9C,CAAC,CAAC,CAAC;YACL,CAAC,CAAC,CAAC;QACL,CAAC,CAAC,CAAC,IAAI,CAAC,CAAC,IAAwC,EAAE,EAAE;YAEnD,MAAM,MAAM,GAAW;gBACrB,OAAO;gBACP,KAAK,EAAE,IAAI,CAAC,MAAM;gBAClB,MAAM,EAAE,IAAI;gBACZ,GAAG,EAAE,IAAI,CAAC,MAAM;aACjB,CAAC;YACF,OAAO,aAAa,CAAC,MAAM,CAAC,CAAC;QAC/B,CAAC,CAAC,CAAC;QAEH,OAAO,oBAAO,CAAC,OAAO,EAAE,QAAQ,CAAC,CAAC;IACpC,CAAC;CACF;AA7ED,kBA6EC;AAkBD,MAAa,OAAO;IAClB,YACS,SAAkB,EAClB,SAAkB,EAClB,YAAqB,EACrB,uBAAgC,EAChC,UAAU,KAAK;QAJf,cAAS,GAAT,SAAS,CAAS;QAClB,cAAS,GAAT,SAAS,CAAS;QAClB,iBAAY,GAAZ,YAAY,CAAS;QACrB,4BAAuB,GAAvB,uBAAuB,CAAS;QAChC,YAAO,GAAP,OAAO,CAAQ;IAAI,CAAC;CAC9B;AAPD,0BAOC"}
\ No newline at end of file
diff --git a/lib/index.spec.js b/lib/index.spec.js
index b5b405d..454f7a7 100644
--- a/lib/index.spec.js
+++ b/lib/index.spec.js
@@ -1,26 +1,6 @@
 "use strict";
-var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
-    if (k2 === undefined) k2 = k;
-    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
-}) : (function(o, m, k, k2) {
-    if (k2 === undefined) k2 = k;
-    o[k2] = m[k];
-}));
-var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
-    Object.defineProperty(o, "default", { enumerable: true, value: v });
-}) : function(o, v) {
-    o["default"] = v;
-});
-var __importStar = (this && this.__importStar) || function (mod) {
-    if (mod && mod.__esModule) return mod;
-    var result = {};
-    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
-    __setModuleDefault(result, mod);
-    return result;
-};
 Object.defineProperty(exports, "__esModule", { value: true });
 const index_1 = require("./index");
-const util = __importStar(require("util"));
 /* eslint-disable @typescript-eslint/no-var-requires */
 const config = require('../my_config.json');
 //console.log('config', config);
@@ -35,8 +15,12 @@ describe('iam list-users', () => {
         /* currentWorkingDirectory */ undefined, 
         /* cliPath */ 'aws');
         const aws = new index_1.Aws(options);
-        return aws.command('iam list-users').then((data) => {
-            console.log('data = ', util.inspect(data, { depth: 10 }));
+        //const command = 'iam list-users --region us-west-1';
+        const command = `iam \
+    list-users \
+    --region us-west-1`;
+        return aws.command(command).then((data) => {
+            //console.log('data = ', util.inspect(data, { depth: 10 }));
             expect(data).toBeTruthy();
             expect(data.object.Users).toBeTruthy();
         });
diff --git a/lib/index.spec.js.map b/lib/index.spec.js.map
index 411fd66..a001e7d 100644
--- a/lib/index.spec.js.map
+++ b/lib/index.spec.js.map
@@ -1 +1 @@
-{"version":3,"file":"index.spec.js","sourceRoot":"","sources":["../src/index.spec.ts"],"names":[],"mappings":";;;;;;;;;;;;;;;;;;;;;AAAA,mCAAuC;AACvC,2CAA6B;AAE7B,uDAAuD;AACvD,MAAM,MAAM,GAAG,OAAO,CAAC,mBAAmB,CAAC,CAAC;AAE5C,gCAAgC;AAEhC,QAAQ,CAAC,gBAAgB,EAAE,GAAG,EAAE;IAC9B,EAAE,CAAC,aAAa,EAAE,GAAG,EAAE;QACrB,MAAM,MAAM,GAAG,IAAI,CAAC;QAEpB,MAAM,CAAC,MAAM,CAAC,CAAC,UAAU,EAAE,CAAC;QAC5B,MAAM,OAAO,GAAG,IAAI,eAAO;QACzB,kBAAkB,CAAC,MAAM,CAAC,WAAW;QACrC,kBAAkB,CAAC,MAAM,CAAC,eAAe;QACzC,kBAAkB,CAAC,MAAM,CAAC,YAAY;QACtC,6BAA6B,CAAC,SAAS;QACvC,aAAa,CAAC,KAAK,CACpB,CAAC;QAGF,MAAM,GAAG,GAAG,IAAI,WAAG,CAAC,OAAO,CAAC,CAAC;QAE7B,OAAO,GAAG,CAAC,OAAO,CAAC,gBAAgB,CAAC,CAAC,IAAI,CAAC,CAAC,IAAS,EAAE,EAAE;YACtD,OAAO,CAAC,GAAG,CAAC,SAAS,EAAE,IAAI,CAAC,OAAO,CAAC,IAAI,EAAE,EAAE,KAAK,EAAE,EAAE,EAAE,CAAC,CAAC,CAAC;YAC1D,MAAM,CAAC,IAAI,CAAC,CAAC,UAAU,EAAE,CAAC;YAC1B,MAAM,CAAC,IAAI,CAAC,MAAM,CAAC,KAAK,CAAC,CAAC,UAAU,EAAE,CAAC;QACzC,CAAC,CAAC,CAAC;IAGL,CAAC,CAAC,CAAC;AACL,CAAC,CAAC,CAAC;AAGH,qCAAqC;AACrC,wDAAwD;AACxD,2BAA2B;AAE3B,mCAAmC;AACnC,mCAAmC;AACnC,+CAA+C;AAC/C,mDAAmD;AACnD,sCAAsC;AACtC,iDAAiD;AACjD,SAAS;AAGT,oCAAoC;AAEpC,wBAAwB;AACxB,iEAAiE;AACjE,qBAAqB;AACrB,wBAAwB;AACxB,kCAAkC;AAClC,kCAAkC;AAClC,UAAU;AAGV,QAAQ;AACR,MAAM"}
\ No newline at end of file
+{"version":3,"file":"index.spec.js","sourceRoot":"","sources":["../src/index.spec.ts"],"names":[],"mappings":";;AAAA,mCAAuC;AAGvC,uDAAuD;AACvD,MAAM,MAAM,GAAG,OAAO,CAAC,mBAAmB,CAAC,CAAC;AAE5C,gCAAgC;AAEhC,QAAQ,CAAC,gBAAgB,EAAE,GAAG,EAAE;IAC9B,EAAE,CAAC,aAAa,EAAE,GAAG,EAAE;QACrB,MAAM,MAAM,GAAG,IAAI,CAAC;QAEpB,MAAM,CAAC,MAAM,CAAC,CAAC,UAAU,EAAE,CAAC;QAC5B,MAAM,OAAO,GAAG,IAAI,eAAO;QACzB,kBAAkB,CAAC,MAAM,CAAC,WAAW;QACrC,kBAAkB,CAAC,MAAM,CAAC,eAAe;QACzC,kBAAkB,CAAC,MAAM,CAAC,YAAY;QACtC,6BAA6B,CAAC,SAAS;QACvC,aAAa,CAAC,KAAK,CACpB,CAAC;QAGF,MAAM,GAAG,GAAG,IAAI,WAAG,CAAC,OAAO,CAAC,CAAC;QAE7B,sDAAsD;QACtD,MAAM,OAAO,GAAG;;uBAEG,CAAC;QAGpB,OAAO,GAAG,CAAC,OAAO,CAAC,OAAO,CAAC,CAAC,IAAI,CAAC,CAAC,IAAS,EAAE,EAAE;YAC7C,4DAA4D;YAC5D,MAAM,CAAC,IAAI,CAAC,CAAC,UAAU,EAAE,CAAC;YAC1B,MAAM,CAAC,IAAI,CAAC,MAAM,CAAC,KAAK,CAAC,CAAC,UAAU,EAAE,CAAC;QACzC,CAAC,CAAC,CAAC;IAGL,CAAC,CAAC,CAAC;AACL,CAAC,CAAC,CAAC;AAGH,qCAAqC;AACrC,wDAAwD;AACxD,2BAA2B;AAE3B,mCAAmC;AACnC,mCAAmC;AACnC,+CAA+C;AAC/C,mDAAmD;AACnD,sCAAsC;AACtC,iDAAiD;AACjD,SAAS;AAGT,oCAAoC;AAEpC,wBAAwB;AACxB,iEAAiE;AACjE,qBAAqB;AACrB,wBAAwB;AACxB,kCAAkC;AAClC,kCAAkC;AAClC,UAAU;AAGV,QAAQ;AACR,MAAM"}
\ No newline at end of file
diff --git a/src/index.spec.ts b/src/index.spec.ts
index 22d143d..a951f50 100644
--- a/src/index.spec.ts
+++ b/src/index.spec.ts
@@ -22,7 +22,13 @@ describe('iam list-users', () => {
 
     const aws = new Aws(options);
 
-    return aws.command('iam list-users').then((data: any) => {
+    //const command = 'iam list-users --region us-west-1';
+    const command = `iam \
+    list-users \
+    --region us-west-1`;
+
+
+    return aws.command(command).then((data: any) => {
       //console.log('data = ', util.inspect(data, { depth: 10 }));
       expect(data).toBeTruthy();
       expect(data.object.Users).toBeTruthy();
@@ -33,30 +39,30 @@ describe('iam list-users', () => {
 });
 
 
-describe('iam list-users', () => {
-  it('should fail with invalid sessionToken', () => {
-    const result = true;
+// describe('iam list-users', () => {
+//   it('should fail with invalid sessionToken', () => {
+//     const result = true;
 
-    expect(result).toBeTruthy();
-    const options = new Options(
-      /* accessKey    */ config.accessKeyId,
-      /* secretKey    */ config.secretAccessKey,
-      /* sessionToken */ 'invalid',
-      /* currentWorkingDirectory */ undefined,
-    );
+//     expect(result).toBeTruthy();
+//     const options = new Options(
+//       /* accessKey    */ config.accessKeyId,
+//       /* secretKey    */ config.secretAccessKey,
+//       /* sessionToken */ 'invalid',
+//       /* currentWorkingDirectory */ undefined,
+//     );
 
 
-    const aws = new Aws(options);
+//     const aws = new Aws(options);
 
-    let flag = false;
-    return aws.command('iam list-users').then((data: any) => {
-      flag = true;
-    }).catch((r) => {
-      expect(flag).toBeFalsy();
-      //console.log('r = ', r);
-    });
+//     let flag = false;
+//     return aws.command('iam list-users').then((data: any) => {
+//       flag = true;
+//     }).catch((r) => {
+//       expect(flag).toBeFalsy();
+//       //console.log('r = ', r);
+//     });
 
 
-  });
-});
+//   });
+// });
 
diff --git a/src/index.ts b/src/index.ts
index 2b6681f..d882c60 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -61,8 +61,12 @@ export class Aws {
 
       //console.log('exec options =', execOptions);
       //console.log('options.cliPath =', this.options.cliPath);
+      let cmd = [...command.split(' ')];
+      cmd = cmd.filter(v => v.length > 0);
+      //console.log('cmd2 = ', cmd);      
+
       return new Promise<{ stderr: string, stdout: string }>( (resolve, reject) => {
-        execFile(this.options.cliPath, [...command.split(' ')], execOptions, (error: Error | null, stdout: string, stderr: string) => {
+        execFile(this.options.cliPath, cmd, execOptions, (error: Error | null, stdout: string, stderr: string) => {
           if (error) {
             const message = `error: '${error}' stdout = '${stdout}' stderr = '${stderr}'`;
             //console.error(message);