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+Exercises
+=========
+
+Session-1
+---------
+
+1. Login to your machine from the CLI prompt, by pressing Ctrl+Alt+F1. 
+
+#. Logout and re-login. 
+
+#. What is your present working directory, once you login?
+
+#. List all the files present in your current working directory. 
+
+#. Navigate to the ``Desktop`` directory. If such a directory is not
+   present create one.
+
+#. Navigate back to the ``home`` directory. 
+
+#. Create a directory called ``ult`` inside another directory called
+   ``sees``. Create both the directories in a single command.
+
+#. What would be your present working directory after doing the
+   following?
+
+   ::
+   
+       cd ~/sees/./../
+
+#. Use the touch command to create a file with your name in the
+   ``ult`` folder.
+
+#. Remove the file you created in the previous step. 
+
+#. Navigate to your home directory and remove the directory
+   ``sees``. Use ``rm`` command.
+
+#. Re-create the directories ``sees`` and ``ult`` again. Now, remove
+   them using the ``rmdir`` command. Use ``man`` or ``--help``, if
+   required.
+
+#. Create a file with your first-name in your home directory and copy
+   it to ``sees/ult``.
+
+#. Copy the file again, but this time, ensure that ``cp`` checks if
+   such a file doesn't already exist.
+
+#. Copy the directory ``sees`` to the directory ``sttp``.
+
+#. Rename directory ``sttp`` with your name.
+
+#. Create a file ``test`` and modify its permission for user and group
+   to ``execute``.
+
+#. For the same ``test`` file, change mode to ``r,w,x`` for
+   all(user,group,others).
+
+#. Change ownership of the file ``test`` to some other user (if exists).
+
+#. Count the number of files (files, sub-directories, etc.) in a directory. 
+
+#. Create a new file ``alice.txt`` by concatenating the first 30 lines
+   and the last 40 lines of ``wonderland.txt``.
+
+#. Show the lines from 10 to 20 of ``primes.txt`` 
+
+#. Concatenate the content of ``foo.txt`` and ``bar.txt`` in a single
+   ``foobar.txt`` but with the ``source:wikipedia`` line appearing only
+   once, at the end of the file. 
+
+Session-2
+---------
+
+0. Read through the section ``REGULAR EXPRESSIONS`` in ``man grep``
+
+#. Read through in ``man expr``
+
+#. grep the marks of the students who scored above 75 in atleast one
+   subject. 
+
+#. grep the marks of all the students whose names begin with an 's'
+
+#. grep the marks of all the students whose names begin with
+   consonants. 
+
+#. change the results.sh script to accept the input files also as
+   arguments. 
+
+#. Write a shell script that will take a filename as input and check
+   if it is executable. 
+
+#. Modify the script in the previous step, to remove the execute
+   permissions, if the file is executable. 
+
+#. Write a shell script to remove all executable files from a
+   directory, when a directory is given as argument. 
+
+#. List all the years between 2001 and 2099 which have 5 Fridays,
+   Saturdays and Sundays in the month of July. Hint: ``man cal``
+
+#. Generate frequency list of all the commands you have used, and show
+   the top 5 commands along with their count. (Hint: ``history`` command
+   will give you a list of all commands used.)
+
+#. generate a word frequency list for ``wonderland.txt``. Hint: use
+   ``grep``, ``tr``, ``sort``, ``uniq`` (or anything else that you want)
+
+#. **Print the middle line of a file**. 
+