Update session1.md

session1.md

@@ -38,6 +38,7 @@ Refer [How to Manage Files from the Linux Terminal: 11 Commands You Need to Know
  10. `touch` – Create Empty Files
  11. `mc` – A Full File Manager (TUI - Terminal User Interface)
 
+Refer [FLOSS Manuals - Put Yourself in Command](http://write.flossmanuals.net/command-line/introduction/ "Put Yourself in Command") for command line tutorial
 # Filesystem Hierarchy Standard
 
 Refer [Filesystem Hierarchy Standard](https://refspecs.linuxfoundation.org/FHS_3.0/fhs/index.html "Filesystem Hierarchy Standard")
@@ -100,11 +101,17 @@ Refer [Bash Environment Variables Tutorial](https://linuxhint.com/bash-environme
   * `$HOME` - the path to the home directory of the user.
   * `$PATH` - directories in which the shell looks for commands.
   * `$PS1` - first prompt string.
+    * Try changing the value of PS1
+      ```bash
+        jyothisjagan@jyothisjagan:~$ PS1="hello$"
+        hello$
+      ```
+
 
 # Miscellaneous
 
 ## Hidden Files
-  * Starts with dot(.)
+  * File/directory name starts with dot(.)
   * Usually used for user specific configurations.
   * `.bashrc` is used for configuring bash. `.bashrc` file can be found in home directory for each user.
   * Use `ls -a` in your home directory, you will see all of them