improve usability in ex3 week4

week04/ex3.sh

@@ -7,7 +7,7 @@ sleep 1
 i=0
 while [ $i -lt 3 ]
 do
-    pstree
+    pstree $$
     sleep 5
     i=$(( i + 1 ))
 done
@@ -18,7 +18,7 @@ sleep 1
 i=0
 while [ $i -lt 5 ]
 do
-    pstree
+    pstree $$
     sleep 5
     i=$(( i + 1 ))
 done