diff --git a/pdf/index_for_pdf.html b/pdf/index_for_pdf.html
index 2636523..e411647 100644
--- a/pdf/index_for_pdf.html
+++ b/pdf/index_for_pdf.html
@@ -48,7 +48,7 @@
 <strong>eval function, <a href="#eval">33</a></strong><br>
 <strong>exceptions, <a href="#exceptions">20</a>-<a href="#exceptionobject">21</a>, <a href="#exceptions-1">23</a>, <a href="#exceptions-2">35</a></strong>  </p>
 <h3 id="f">F</h3>
-<p><strong>files, <a href="#print">22</a>-<a href="#csv">26</a>, <a href="#readbytesfromfile">28</a>, <a href="#encodedecode">46</a></strong><br>
+<p><strong>files, <a href="#print">22</a>-<a href="#memoryview">29</a>, <a href="#runsabasicfileexplorerintheterminal">34</a>, <a href="#encodedecode">46</a></strong><br>
 <strong>filter function, <a href="#mapfilterreduce">11</a></strong><br>
 <strong>floats, <a href="#abstractbaseclasses">4</a>, <a href="#floats">6</a>, <a href="#types">7</a></strong><br>
 <strong>format, <a href="#format">6</a>-<a href="#comparisonofpresentationtypes">7</a></strong><br>
@@ -94,11 +94,11 @@
 <h3 id="o">O</h3>
 <p><strong>open function, <a href="#contextmanager">17</a>, <a href="#open">22</a>-<a href="#modes">23</a>, <a href="#readobjectfromjsonfile">25</a>, <a href="#readrowsfromcsvfile">26</a>, <a href="#readbytesfromfile">28</a></strong><br>
 <strong>operator module, <a href="#operator">31</a></strong><br>
-<strong>os commands, <a href="#path">23</a>-<a href="#shellcommands">25</a></strong>  </p>
+<strong>os commands, <a href="#path">23</a>-<a href="#shellcommands">25</a>, <a href="#runsabasicfileexplorerintheterminal">34</a></strong>  </p>
 <h3 id="p">P</h3>
 <p><strong>pandas library, <a href="#pandas">44</a>-<a href="#confirmedcovidcasesdowjonesgoldandbitcoinprice">48</a></strong><br>
 <strong>partial function, <a href="#partial">12</a>, <a href="#userdefinedfunctionscannotbevaluessotheymustbewrapped">20</a></strong><br>
-<strong>path, <a href="#path">23</a>-<a href="#direntry">24</a></strong><br>
+<strong>path, <a href="#path">23</a>-<a href="#direntry">24</a>, <a href="#runsabasicfileexplorerintheterminal">34</a></strong><br>
 <strong>pickle module, <a href="#pickle">25</a></strong><br>
 <strong>pillow library, <a href="#image">39</a>-<a href="#animation">40</a></strong><br>
 <strong>plotting, <a href="#plot">34</a>, <a href="#plotly">47</a>-<a href="#confirmedcovidcasesdowjonesgoldandbitcoinprice">48</a></strong><br>
diff --git a/pdf/index_for_pdf_print.html b/pdf/index_for_pdf_print.html
index 2d0834d..984d4b9 100644
--- a/pdf/index_for_pdf_print.html
+++ b/pdf/index_for_pdf_print.html
@@ -48,7 +48,7 @@
 <strong>eval function, 33</strong><br>
 <strong>exceptions, 20-21, 23, 35</strong>  </p>
 <h3 id="f">F</h3>
-<p><strong>files, 22-26, 28, 46</strong><br>
+<p><strong>files, 22-29, 34, 46</strong><br>
 <strong>filter function, 11</strong><br>
 <strong>floats, 4, 6, 7</strong><br>
 <strong>format, 6-7</strong><br>
@@ -94,11 +94,11 @@
 <h3 id="o">O</h3>
 <p><strong>open function, 17, 22-23, 25, 26, 28</strong><br>
 <strong>operator module, 31</strong><br>
-<strong>os commands, 23-25</strong>  </p>
+<strong>os commands, 23-25, 34</strong>  </p>
 <h3 id="p">P</h3>
 <p><strong>pandas library, 44-48</strong><br>
 <strong>partial function, 12, 20</strong><br>
-<strong>path, 23-24</strong><br>
+<strong>path, 23-24, 34</strong><br>
 <strong>pickle module, 25</strong><br>
 <strong>pillow library, 39-40</strong><br>
 <strong>plotting, 34, 47-48</strong><br>