diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 511d383d5849e8ba63ef0d6a270ad4b55da89a27..40d623844e8de3c10fdce23561dcce8ecdbbd3c5 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -10,7 +10,8 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" id="8239070f-6583-4d64-a292-d827a40a35ed" name="Default" comment="">
-      <change beforePath="$PROJECT_DIR$/src/utils.c" beforeDir="false" afterPath="$PROJECT_DIR$/src/utils.c" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/commands.c" beforeDir="false" afterPath="$PROJECT_DIR$/src/commands.c" afterDir="false" />
     </list>
     <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
     <option name="TRACKING_ENABLED" value="true" />
@@ -20,81 +21,63 @@
     <option name="LAST_RESOLUTION" value="IGNORE" />
   </component>
   <component name="FileEditorManager">
-    <splitter split-orientation="horizontal" split-proportion="0.20726992">
-      <split-first>
-        <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
-          <file leaf-file-name="built_in.c" pinned="false" current-in-tab="false">
-            <entry file="file://$PROJECT_DIR$/src/built_in.c">
-              <provider selected="true" editor-type-id="text-editor">
-                <state relative-caret-position="-459">
-                  <caret line="41" column="20" selection-start-line="41" selection-start-column="20" selection-end-line="41" selection-end-column="20" />
-                </state>
-              </provider>
-            </entry>
-          </file>
-          <file leaf-file-name="built_in.h" pinned="false" current-in-tab="false">
-            <entry file="file://$PROJECT_DIR$/include/built_in.h">
-              <provider selected="true" editor-type-id="text-editor" />
-            </entry>
-          </file>
-          <file leaf-file-name="main.c" pinned="false" current-in-tab="true">
-            <entry file="file://$PROJECT_DIR$/src/main.c">
-              <provider selected="true" editor-type-id="text-editor">
-                <state relative-caret-position="152">
-                  <caret line="8" lean-forward="true" selection-start-line="8" selection-end-line="8" />
-                </state>
-              </provider>
-            </entry>
-          </file>
-          <file leaf-file-name="utils.c" pinned="false" current-in-tab="false">
-            <entry file="file://$PROJECT_DIR$/src/utils.c">
-              <provider selected="true" editor-type-id="text-editor">
-                <state relative-caret-position="225">
-                  <caret line="17" selection-start-line="17" selection-end-line="17" />
-                </state>
-              </provider>
-            </entry>
-          </file>
-        </leaf>
-      </split-first>
-      <split-second>
-        <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
-          <file leaf-file-name="utils.c" pinned="false" current-in-tab="true">
-            <entry file="file://$PROJECT_DIR$/src/utils.c">
-              <provider selected="true" editor-type-id="text-editor">
-                <state relative-caret-position="500">
-                  <caret line="57" column="5" selection-start-line="57" selection-start-column="5" selection-end-line="57" selection-end-column="5" />
-                </state>
-              </provider>
-            </entry>
-          </file>
-          <file leaf-file-name="commands.c" pinned="false" current-in-tab="false">
-            <entry file="file://$PROJECT_DIR$/src/commands.c">
-              <provider selected="true" editor-type-id="text-editor">
-                <state relative-caret-position="1294">
-                  <caret line="91" selection-start-line="91" selection-end-line="91" />
-                </state>
-              </provider>
-            </entry>
-          </file>
-          <file leaf-file-name="signal_handlers.c" pinned="false" current-in-tab="false">
-            <entry file="file://$PROJECT_DIR$/src/signal_handlers.c">
-              <provider selected="true" editor-type-id="text-editor">
-                <state relative-caret-position="228">
-                  <caret line="12" column="21" selection-start-line="12" selection-start-column="21" selection-end-line="12" selection-end-column="21" />
-                </state>
-              </provider>
-            </entry>
-          </file>
-        </leaf>
-      </split-second>
-    </splitter>
+    <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
+      <file leaf-file-name="built_in.c" pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/src/built_in.c">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="-314">
+              <caret line="41" column="20" selection-start-line="41" selection-start-column="20" selection-end-line="41" selection-end-column="20" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file leaf-file-name="main.c" pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/src/main.c">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="266">
+              <caret line="14" column="14" selection-start-line="14" selection-start-column="14" selection-end-line="14" selection-end-column="14" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file leaf-file-name="utils.c" pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/src/utils.c">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="465">
+              <caret line="46" column="7" selection-start-line="46" selection-start-column="7" selection-end-line="46" selection-end-column="7" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file leaf-file-name="commands.c" pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/src/commands.c">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="-152">
+              <caret line="37" column="1" lean-forward="true" selection-start-line="37" selection-start-column="1" selection-end-line="37" selection-end-column="1" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file leaf-file-name="signal_handlers.c" pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/src/signal_handlers.c">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="228">
+              <caret line="12" column="21" selection-start-line="12" selection-start-column="21" selection-end-line="12" selection-end-column="21" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+    </leaf>
   </component>
   <component name="FindInProjectRecents">
     <findStrings>
       <find>single_command</find>
       <find>execvp</find>
       <find>print</find>
+      <find>~</find>
+      <find>n_commands</find>
+      <find>free_commands</find>
+      <find>evaluate_command</find>
     </findStrings>
   </component>
   <component name="Git.Settings">
@@ -104,10 +87,10 @@
     <option name="CHANGED_PATHS">
       <list>
         <option value="$PROJECT_DIR$/src/built_in.c" />
-        <option value="$PROJECT_DIR$/src/commands.c" />
         <option value="$PROJECT_DIR$/src/main.c" />
         <option value="$PROJECT_DIR$/src/signal_handlers.c" />
         <option value="$PROJECT_DIR$/src/utils.c" />
+        <option value="$PROJECT_DIR$/src/commands.c" />
       </list>
     </option>
   </component>
@@ -121,9 +104,9 @@
     <packageJsonPaths />
   </component>
   <component name="OCFindUsagesOptions" text="true" ivars="false" properties="true" derivedClasses="false" />
-  <component name="ProjectFrameBounds">
-    <option name="x" value="70" />
-    <option name="width" value="1878" />
+  <component name="ProjectFrameBounds" extendedState="1">
+    <option name="x" value="1751" />
+    <option name="width" value="1698" />
     <option name="height" value="1448" />
   </component>
   <component name="ProjectView">
@@ -131,7 +114,6 @@
       <foldersAlwaysOnTop value="true" />
     </navigator>
     <panes>
-      <pane id="Scope" />
       <pane id="ProjectPane">
         <subPane>
           <expand>
@@ -158,11 +140,12 @@
           <select />
         </subPane>
       </pane>
+      <pane id="Scope" />
     </panes>
   </component>
   <component name="PropertiesComponent">
     <property name="WebServerToolWindowFactoryState" value="false" />
-    <property name="last_opened_file_path" value="$PROJECT_DIR$/../workspace/shell" />
+    <property name="last_opened_file_path" value="$PROJECT_DIR$/../workspace/dong/mysh-1" />
   </component>
   <component name="RunDashboard">
     <option name="ruleStates">
@@ -187,34 +170,39 @@
       <option name="presentableId" value="Default" />
       <updated>1525613937527</updated>
       <workItem from="1525613939581" duration="14984000" />
-      <workItem from="1525845591506" duration="9784000" />
+      <workItem from="1525845591506" duration="12797000" />
+      <workItem from="1525873924134" duration="1369000" />
+      <workItem from="1526030788833" duration="82000" />
+      <workItem from="1526030882114" duration="6000" />
+      <workItem from="1526031239879" duration="642000" />
+      <workItem from="1526032501602" duration="4775000" />
     </task>
     <servers />
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="24768000" />
+    <option name="totallyTimeSpent" value="34655000" />
   </component>
   <component name="ToolWindowManager">
-    <frame x="56" y="0" width="1502" height="1158" extended-state="0" />
+    <frame x="1401" y="0" width="1358" height="1158" extended-state="0" />
     <editor active="true" />
     <layout>
-      <window_info content_ui="combo" id="Project" order="0" visible="true" weight="0.13104838" />
+      <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.14508928" />
       <window_info anchor="bottom" id="TODO" order="6" />
-      <window_info anchor="bottom" id="Event Log" order="7" side_tool="true" />
+      <window_info anchor="bottom" id="Event Log" order="10" side_tool="true" />
+      <window_info anchor="bottom" id="Version Control" order="8" />
       <window_info anchor="bottom" id="Run" order="2" />
-      <window_info anchor="bottom" id="Version Control" order="7" />
       <window_info id="Structure" order="1" side_tool="true" weight="0.25" />
-      <window_info active="true" anchor="bottom" id="Terminal" order="7" visible="true" weight="0.30938697" />
-      <window_info anchor="bottom" id="Debug" order="3" weight="0.4" />
+      <window_info anchor="bottom" id="Terminal" order="7" visible="true" weight="0.20689656" />
       <window_info id="Favorites" order="2" side_tool="true" />
+      <window_info anchor="bottom" id="Debug" order="3" weight="0.4" />
       <window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
-      <window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
       <window_info anchor="right" id="Commander" internal_type="SLIDING" order="0" type="SLIDING" weight="0.4" />
       <window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
-      <window_info anchor="bottom" id="Find" order="1" />
-      <window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
+      <window_info anchor="bottom" id="Messages" order="9" />
       <window_info anchor="bottom" id="Message" order="0" />
-      <window_info anchor="bottom" id="Messages" order="7" />
+      <window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
+      <window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
+      <window_info anchor="bottom" id="Find" order="1" />
     </layout>
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -226,41 +214,147 @@
   <component name="editorHistoryManager">
     <entry file="file://$PROJECT_DIR$/src/built_in.c">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="1444">
-          <caret line="76" column="25" lean-forward="true" selection-start-line="76" selection-start-column="25" selection-end-line="76" selection-end-column="25" />
+        <state relative-caret-position="779">
+          <caret line="41" column="20" selection-start-line="41" selection-start-column="20" selection-end-line="41" selection-end-column="20" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/include/built_in.h">
-      <provider selected="true" editor-type-id="text-editor" />
+    <entry file="file://$PROJECT_DIR$/src/main.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="247">
+          <caret line="13" column="17" lean-forward="true" selection-start-line="13" selection-start-column="17" selection-end-line="16" selection-end-column="13" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/utils.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="760">
+          <caret line="40" column="15" selection-start-line="40" selection-start-column="15" selection-end-line="40" selection-end-column="15" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/signal_handlers.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="228">
+          <caret line="12" column="21" selection-start-line="12" selection-start-column="21" selection-end-line="12" selection-end-column="21" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/commands.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="969">
+          <caret line="51" column="15" lean-forward="true" selection-start-line="51" selection-start-column="15" selection-end-line="51" selection-end-column="15" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/built_in.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="779">
+          <caret line="41" column="20" selection-start-line="41" selection-start-column="20" selection-end-line="41" selection-end-column="20" />
+        </state>
+      </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/main.c">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="266">
-          <caret line="14" selection-start-line="14" selection-end-line="14" />
+        <state relative-caret-position="152">
+          <caret line="8" selection-start-line="8" selection-end-line="8" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/utils.c">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="513">
-          <caret line="27" column="1" lean-forward="true" selection-start-line="27" selection-start-column="1" selection-end-line="27" selection-end-column="1" />
+        <state relative-caret-position="760">
+          <caret line="40" column="15" selection-start-line="40" selection-start-column="15" selection-end-line="40" selection-end-column="15" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/signal_handlers.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="228">
+          <caret line="12" column="21" selection-start-line="12" selection-start-column="21" selection-end-line="12" selection-end-column="21" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/commands.c">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="1311">
-          <caret line="69" column="63" lean-forward="true" selection-start-line="69" selection-start-column="63" selection-end-line="69" selection-end-column="63" />
+        <state relative-caret-position="988">
+          <caret line="52" column="6" selection-start-line="52" selection-start-column="6" selection-end-line="52" selection-end-column="6" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/built_in.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="779">
+          <caret line="41" column="20" selection-start-line="41" selection-start-column="20" selection-end-line="41" selection-end-column="20" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="152">
+          <caret line="8" selection-start-line="8" selection-end-line="8" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/utils.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="760">
+          <caret line="40" column="15" selection-start-line="40" selection-start-column="15" selection-end-line="40" selection-end-column="15" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/signal_handlers.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="228">
+          <caret line="12" column="21" selection-start-line="12" selection-start-column="21" selection-end-line="12" selection-end-column="21" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/commands.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="988">
+          <caret line="52" column="6" selection-start-line="52" selection-start-column="6" selection-end-line="52" selection-end-column="6" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/include/built_in.h">
-      <provider selected="true" editor-type-id="text-editor" />
+    <entry file="file://$PROJECT_DIR$/src/built_in.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="779">
+          <caret line="41" column="20" selection-start-line="41" selection-start-column="20" selection-end-line="41" selection-end-column="20" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="152">
+          <caret line="8" selection-start-line="8" selection-end-line="8" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/utils.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="760">
+          <caret line="40" column="15" selection-start-line="40" selection-start-column="15" selection-end-line="40" selection-end-column="15" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/signal_handlers.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="228">
+          <caret line="12" column="21" selection-start-line="12" selection-start-column="21" selection-end-line="12" selection-end-column="21" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/commands.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="988">
+          <caret line="52" column="6" selection-start-line="52" selection-start-column="6" selection-end-line="52" selection-end-column="6" />
+        </state>
+      </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/built_in.c">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="-459">
+        <state relative-caret-position="779">
           <caret line="41" column="20" selection-start-line="41" selection-start-column="20" selection-end-line="41" selection-end-column="20" />
         </state>
       </provider>
@@ -272,6 +366,13 @@
         </state>
       </provider>
     </entry>
+    <entry file="file://$PROJECT_DIR$/src/utils.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="760">
+          <caret line="40" column="15" lean-forward="true" selection-start-line="40" selection-start-column="15" selection-end-line="40" selection-end-column="15" />
+        </state>
+      </provider>
+    </entry>
     <entry file="file://$PROJECT_DIR$/src/signal_handlers.c">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="228">
@@ -281,15 +382,71 @@
     </entry>
     <entry file="file://$PROJECT_DIR$/src/commands.c">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="1294">
-          <caret line="91" selection-start-line="91" selection-end-line="91" />
+        <state relative-caret-position="988">
+          <caret line="52" column="6" selection-start-line="52" selection-start-column="6" selection-end-line="52" selection-end-column="6" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/built_in.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="1444">
+          <caret line="76" column="25" lean-forward="true" selection-start-line="76" selection-start-column="25" selection-end-line="76" selection-end-column="25" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="266">
+          <caret line="14" selection-start-line="14" selection-end-line="14" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/utils.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="513">
+          <caret line="27" column="1" lean-forward="true" selection-start-line="27" selection-start-column="1" selection-end-line="27" selection-end-column="1" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/commands.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="1311">
+          <caret line="69" column="63" lean-forward="true" selection-start-line="69" selection-start-column="63" selection-end-line="69" selection-end-column="63" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/built_in.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="-314">
+          <caret line="41" column="20" selection-start-line="41" selection-start-column="20" selection-end-line="41" selection-end-column="20" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/commands.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="-152">
+          <caret line="37" column="1" lean-forward="true" selection-start-line="37" selection-start-column="1" selection-end-line="37" selection-end-column="1" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/src/utils.c">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="500">
-          <caret line="57" column="5" selection-start-line="57" selection-start-column="5" selection-end-line="57" selection-end-column="5" />
+        <state relative-caret-position="465">
+          <caret line="46" column="7" selection-start-line="46" selection-start-column="7" selection-end-line="46" selection-end-column="7" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/signal_handlers.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="228">
+          <caret line="12" column="21" selection-start-line="12" selection-start-column="21" selection-end-line="12" selection-end-column="21" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main.c">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="266">
+          <caret line="14" column="14" selection-start-line="14" selection-start-column="14" selection-end-line="14" selection-end-column="14" />
         </state>
       </provider>
     </entry>
diff --git a/201221030.docx b/201221030.docx
new file mode 100644
index 0000000000000000000000000000000000000000..282cbaf74b7849b2a05145d39086fda6d96898ab
Binary files /dev/null and b/201221030.docx differ
diff --git a/src/commands.c b/src/commands.c
index 5d4ad560e447e3e89c26d35a5e22730c8a5319b2..cfa2891bf7688023f4f38af8ed90e02f447a4a26 100644
--- a/src/commands.c
+++ b/src/commands.c
@@ -28,7 +28,15 @@ static int is_built_in_command(const char* command_name)
 /*
  * Description: Currently this function only handles single built_in commands. You should modify this structure to launch process and offer pipeline functionality.
  */
-int evaluate_command(int n_commands, struct single_command (*commands)[512])
+int evaluate_command(int n_commands, struct single_command (*commands)[512]) {
+    if (n_commands == 1) {
+        struct single_command *com = (*commands);
+        one_command(n_commands, com);
+    } else if (n_commands > 1){
+        printf("pipe");
+    }
+}
+int one_command(int n_commands, struct single_command (*commands)[512])
 {
   if (n_commands > 0) {
     struct single_command* com = (*commands);
@@ -53,6 +61,7 @@ int evaluate_command(int n_commands, struct single_command (*commands)[512])
     } else if (validate_path(com->argc, com->argv)) {
       int pid;
 
+
       pid = fork();
 
       if (pid == -1) {
@@ -76,6 +85,8 @@ int evaluate_command(int n_commands, struct single_command (*commands)[512])
   return 0;
 }
 
+
+
 void free_commands(int n_commands, struct single_command (*commands)[512])
 {
   for (int i = 0; i < n_commands; ++i) {