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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**.
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