diff --git a/content/roadmaps/102-devops/content/102-managing-servers/101-live-in-terminal/135-dtrace.md b/content/roadmaps/102-devops/content/102-managing-servers/101-live-in-terminal/135-dtrace.md
index e16ffe004..75ded56f6 100644
--- a/content/roadmaps/102-devops/content/102-managing-servers/101-live-in-terminal/135-dtrace.md
+++ b/content/roadmaps/102-devops/content/102-managing-servers/101-live-in-terminal/135-dtrace.md
@@ -1 +1,7 @@
-# Dtrace
\ No newline at end of file
+# DTrace
+
+DTrace is a comprehensive dynamic tracing framework ported from Solaris. DTrace provides a powerful infrastructure that permits administrators, developers, and service personnel to concisely answer arbitrary questions about the behavior of the operating system and user programs.
+
+Free Content
+df manual
+Wikipedia - DTrace
diff --git a/content/roadmaps/102-devops/content/102-managing-servers/101-live-in-terminal/138-df.md b/content/roadmaps/102-devops/content/102-managing-servers/101-live-in-terminal/138-df.md
index 7d570fbd3..107acc227 100644
--- a/content/roadmaps/102-devops/content/102-managing-servers/101-live-in-terminal/138-df.md
+++ b/content/roadmaps/102-devops/content/102-managing-servers/101-live-in-terminal/138-df.md
@@ -3,5 +3,6 @@
`df` is a standard Unix command used to display the amount of available disk space for file systems on which the invoking user has appropriate read access. df is typically implemented using the statfs or statvfs system calls.
Useful Links
-df man page
-df command with examples
+df manual
+Redhat - Check your disk space use with the Linux df command
+df command with examples
diff --git a/content/roadmaps/102-devops/content/102-managing-servers/101-live-in-terminal/140-du.md b/content/roadmaps/102-devops/content/102-managing-servers/101-live-in-terminal/140-du.md
index eff0f4424..8a4095783 100644
--- a/content/roadmaps/102-devops/content/102-managing-servers/101-live-in-terminal/140-du.md
+++ b/content/roadmaps/102-devops/content/102-managing-servers/101-live-in-terminal/140-du.md
@@ -1,15 +1,8 @@
# Du
-The du (**D**isk **U**sage) command is used to retrieve information about disk space usage information in a specified directory.
+The `du` utility, short for disk usage, displays the file system block usage for each file argument and for each directory in the file hierarchy rooted in each directory argument. If no file is specified, the block usage of the hierarchy rooted in the current directory is displayed.
-the basic syntax of the command is the following:
-`du ` or `du`
-
-Usage Example:
-`du /home/nirzak`
-
-It can be used with various flags to customize the outputs. See the man page of this command for more options `man du`
-
-Useful Links
-du man page
-Du command with examples
+Free Content
+du manual
+Redhat - du and the options you should be using
+Du command with examples