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csdms · Jul 29, 2020 · 3b624fd · 3b624fd
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diff --git a/lessons/shell/files-and-directories.md b/lessons/shell/files-and-directories.md
@@ -216,6 +216,8 @@ described in this section.
 | tab               | complete command
 
 
+___
+
 [Introduction to the shell](./index.md) |
 Previous: [index](./index.md) |
 Next: [Creating things](./creating-things.md)
diff --git a/lessons/shell/finding-things.md b/lessons/shell/finding-things.md
@@ -21,6 +21,8 @@ and special characters described in this section.
 | which            | show location of command
 | alias            | make a shortcut for a command
 
+___
+
 [Introduction to the shell](./index.md) |
 Previous: [Pipes and filters](./pipes-and-filters.md)
 Next: [Getting things from elsewhere](./getting-things.md)
diff --git a/lessons/shell/getting-things.md b/lessons/shell/getting-things.md
@@ -17,5 +17,7 @@ The table below summarizes the commands described in this section.
 | gzip     | package and compress/uncompress files
 | tar      | package and compress/uncompress files
 
+___
+
 [Introduction to the shell](./index.md) |
 Previous: [Finding things](./finding-things.md)
diff --git a/lessons/shell/pipes-and-filters.md b/lessons/shell/pipes-and-filters.md
@@ -23,6 +23,8 @@ described in this section.
 | sort              | sorts input
 | sed               | stream editor
 
+___
+
 [Introduction to the shell](./index.md) |
 Previous: [Creating things](./creating-things.md) |
 Next: [Finding things](./finding-things.md)