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Initial repo, laptop cleanup
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‎bash/Bash Exercises.html

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<!DOCTYPE html PUBLIC "-//IETF//DTD HTML//EN">
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<html><head>
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<meta http-equiv="content-type" content="text/html; charset=windows-1252">
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<title>Bash Exercises</title>
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<style>
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ol.a
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{
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list-style-type:lower-alpha;
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}
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h2
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{
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color:red;
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}
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h3 {color:blue;}
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table {border:solid;}
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td {border:solid;}
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.em { color:red; font-weight:bold }
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</style>
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</head>
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<body>
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<h2>Bash Exercises</h2>
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<p>Some of the exercises below are <span class="em">optional</span>
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carrying <span class="em">house points</span>. You need not have to
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submit these as part of your mandatory exercises. The house points
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for these optional exercises are <span class="em">counted once per
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house</span>, and will count against the name of the student
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submitting the earliest. Note that you have to submit all exercises
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at once: so it will be better for your house if different members
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submit different optional parts.</p>
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<p>Of course I encourage everyone to try all the exercises at leisure,
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or at least learn the solutions from colleagues, after the submission
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deadline.</p>
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<h3>Bash file templates</h3>
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<p>For each exercise, you are given a bash file template. Edit this
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template for your solution. In each case, the details of what you are
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supposed to do in the script is given in the template file. This is
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inculcate in you the habit of documenting a script as part of the
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script itself, through appropriate comments. This is also how future
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exams (in bash) will appear.</p>
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<h3>Test cases (coming up)</h3>
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<p>In some cases, test input and the expected output for the test
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input is given. Check against these. Again, future exams (in bash)
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will follow this format: while evaluating, I will use a script against
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one or more test inputs.</p>
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<h3>Submission instructions (coming up)</h3>
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<p>You are given the script prepare-upload.sh which will do the
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obvious. Upload the tgz file resulting from this to moodle as your
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submission.</p>
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<ol>
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<li>Simple sequence of commands, simple if-then-else:
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<ol class="a">
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<li><b>tex2pdf.sh</b>
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Script to generate dvi from latex file,
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and tar the entire directory.
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<br>
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<i>Concepts exercised:</i> script as a sequence of commands
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</li><li><b>tex2pdf-a.sh</b>
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Script to generate dvi from latex file,
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and tar the entire directory, taking one argument.
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<br>
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<i>Concepts exercised:</i> command line argument
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</li><li><b>tex2pdf-b.sh</b>
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Script to generate dvi from latex file,
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and tar the entire directory, taking one argument. Check
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latex compilation success. <i>Hint</i> Learn the use of
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the special shell variable "$?".
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<br>
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<i>Concepts exercised:</i> checking command exit status,
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if-then-else
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</li><li><span class="em">Optional [5HP]:</span>
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<b>tex2pdf-c.sh</b>
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Script to generate dvi from latex file from any location
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and tar the entire directory from the parent directory, taking one argument. Check
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latex compilation success. <i>Hint</i> Learn the use of
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pwd, dirname, and basename; perhaps also pushd and popd.
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<br>
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<i>Concepts exercised:</i> Learning to change directories
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using pushd and popd,
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getting the working directory, dirname, and basename.
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</li><li><b>tcd.sh</b> Timed cd.
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<br>
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<i>Concepts exercised:</i> if-then-else, combining conditionals
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</li>
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<li><b>myopen.sh</b>
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This script opens a file using the right program.
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<br>
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<i>Concepts exercised:</i> if-then-else, string manipulation
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</li>
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<li><span class="em">Optional [1HP]:</span>
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<b>myopen-a.sh</b>
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This script opens a file using the right program, and can
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handle sophisticated extension possibilities
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<br>
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<i>Concepts exercised:</i> if-then-else, string manipulation
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</li>
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</ol>
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</li>
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<li>Involving loops:
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<ol class="a">
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<li><b>photo-rename.sh</b>
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Write a bash script called photo-rename.sh to rename, in a given
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directory, all files of the form ddmmyyyyANY.jpg to
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yyyy-mm-dd-ANY.jpg<br>
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Here, 'dd', 'mm', 'yyyy' correspond to the two digit date, two
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digit month, and four digit year when the photo was taken, and
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'ANY' corresponds to any string (including the empty string, it
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may include spaces).
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The first three fields fields consist only of digits 0 to 9.<br>
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Your script should ignore jpg files which are not of the form
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ddmmyyyyANY.jpg<br>
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Your script should take the directory name as argument; if no
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argument is given, it must print the usage and exit with exit
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value 1. If the given argument does not correspond to a
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directory, the script must exit with exit value 2.<br>
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<br>
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<i>Concepts exercised:</i> loops, learning to handle
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spaces in file/dir names
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</li>
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<li><b>myopen-generic.sh</b>
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This is an enhancement to myopen.sh, making it more
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generic.
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<br>
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<i>Concepts exercised:</i> simple I/O redirection, string manipulation
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</li>
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<li><span class="em">Optional [1HP]:</span>
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<b>myopen-generic-a.sh</b>
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The configuration file should by default be myopen.cfg in the
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home directory. Your script should support overriding this default
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with an environment variable MYOPENCFG; if this environment variable
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is set, its value should be taken as the configuration file.
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<br>
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<i>Concepts exercised:</i> use of environment variables
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</li>
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</ol>
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</li>
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<li>Involving pipes:
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<ol class="a">
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<li><b>photo-dates.sh</b>
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Script to print the date and time of a photo.
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<br>
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<i>Concepts exercised:</i> simple use of pipe
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</li>
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<li><span class="em">Optional [2HP]:</span>
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<b>photo-dates-a.sh</b>
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Script to print the date and time of several photos.
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<br>
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<i>Concepts exercised:</i> simple use of pipe, loops,
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string manipulation
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</li>
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<li><b>get-ip.sh</b>
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Script to get the IP address of your machine.
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<br>
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<i>Concepts exercised:</i> simple use of pipe
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</li>
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<li><span class="em">Optional [2HP]:</span>
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<b>get-ip-a.sh</b>
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Script to print only the IP address of your machine.
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<br>
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<i>Concepts exercised:</i> simple use of pipe, string
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manipulation
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</li>
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<li><b>num-uploaded.sh</b>
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Script to find out how many students have submitted their
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bash assignment so far.
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<br>
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<i>Concepts exercised:</i> use of pipe
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</li>
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<li><span class="em">Optional [10HP]:</span>
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<b>tar-scp.sh</b>
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Script to tar and copy the result to another machine,
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WITHOUT creating any file, in a SINGLE LINE command.
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<br>
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<i>Concepts exercised:</i> forcing tar to output to
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stdout, using ssh to execute a command, use of pipe
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</li>
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</ol>
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</li>
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<li>Involving sed, awk: (coming up)
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</li>
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</ol>
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<hr>
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<address>Bhaskaran Raman</address>
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<!-- hhmts start -->
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Last modified: Sat Aug 31 08:41:57 IST 2013
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<!-- hhmts end -->
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</body></html>

‎bash/Bash Exercises_files/style.html

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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
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<html><head>
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<title>404 Not Found</title>
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</head><body>
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<h1>Not Found</h1>
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<p>The requested URL /cs699/style.css was not found on this server.</p>
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<hr>
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<address>Apache/2.2.22 (Ubuntu) Server at shadowfax.cse.iitb.ac.in Port 80</address>
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</body></html>

‎bash/exercise-template.tgz

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Binary file not shown.

‎bash/exercise-template/Q1-simple/myopen-a.sh

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#!/bin/bash
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# This script should take exactly one argument, a file. It should
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# invoke emacs on the file if the file has a txt extension. It should
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# invoke firefox on the file if the file has a html extension. It
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# should invoke evince on the file if the file has a pdf extension.
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# It should exit reporting error if the file has no extension or if it
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# has some other extension. The script should handle arguments which
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# have multiple '.' characters. For example, the extension for file
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# a.b.txt is 'txt'.

‎bash/exercise-template/Q1-simple/myopen.sh

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#!/bin/bash
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# This script should take exactly one argument, a file. It should
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# invoke emacs on the file if the file has a txt extension. It should
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# invoke firefox on the file if the file has a html extension. It
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# should invoke evince on the file if the file has a pdf extension.
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# It should exit reporting error if the file has no extension or if it
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# has some other extension

‎bash/exercise-template/Q1-simple/paper.aux

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\relax

‎bash/exercise-template/Q1-simple/paper.log

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This is pdfTeX, Version 3.1415926-1.40.10 (TeX Live 2009/Debian) (format=latex 2013.7.24) 28 AUG 2013 17:04
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entering extended mode
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%&-line parsing enabled.
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**paper.tex
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(./paper.tex
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LaTeX2e <2009/09/24>
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Babel <v3.8l> and hyphenation patterns for english, usenglishmax, dumylang, noh
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yphenation, loaded.
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! LaTeX Error: File `plain.cls' not found.
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Type X to quit or <RETURN> to proceed,
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or enter new name. (Default extension: cls)
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Enter file name:
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! Interruption.
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<to be read again>
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}
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l.2 \author
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{Sushant Mahajan}^^M
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?
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No file paper.aux.
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\openout1 = `paper.aux'.
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LaTeX Font Info: Checking defaults for OML/cmm/m/it on input line 5.
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LaTeX Font Info: ... okay on input line 5.
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LaTeX Font Info: Checking defaults for T1/cmr/m/n on input line 5.
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LaTeX Font Info: ... okay on input line 5.
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LaTeX Font Info: Checking defaults for OT1/cmr/m/n on input line 5.
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LaTeX Font Info: ... okay on input line 5.
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LaTeX Font Info: Checking defaults for OMS/cmsy/m/n on input line 5.
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LaTeX Font Info: ... okay on input line 5.
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LaTeX Font Info: Checking defaults for OMX/cmex/m/n on input line 5.
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LaTeX Font Info: ... okay on input line 5.
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LaTeX Font Info: Checking defaults for U/cmr/m/n on input line 5.
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LaTeX Font Info: ... okay on input line 5.
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! LaTeX Error: The font size command \normalsize is not defined:
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there is probably something wrong with the class file.
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See the LaTeX manual or LaTeX Companion for explanation.
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Type H <return> for immediate help.
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...
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l.5 \begin{document}
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?
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! Undefined control sequence.
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l.6 \maketitle
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?
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! Undefined control sequence.
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l.8 \section
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{Simple Section}
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?
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Missing character: There is no S in font nullfont!
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Missing character: There is no i in font nullfont!
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Missing character: There is no m in font nullfont!
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Missing character: There is no p in font nullfont!
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Missing character: There is no l in font nullfont!
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Missing character: There is no e in font nullfont!
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Missing character: There is no S in font nullfont!
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Missing character: There is no e in font nullfont!
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Missing character: There is no c in font nullfont!
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Missing character: There is no t in font nullfont!
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Missing character: There is no i in font nullfont!
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Missing character: There is no o in font nullfont!
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Missing character: There is no n in font nullfont!
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! LaTeX Error: The font size command \normalsize is not defined:
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there is probably something wrong with the class file.
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See the LaTeX manual or LaTeX Companion for explanation.
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Type H <return> for immediate help.
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...
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l.10 \end{document}
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? X
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Here is how much of TeX's memory you used:
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14 strings out of 495062
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426 string characters out of 1182644
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45108 words of memory out of 3000000
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3287 multiletter control sequences out of 15000+50000
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3948 words of font info for 15 fonts, out of 3000000 for 9000
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28 hyphenation exceptions out of 8191
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22i,2n,15p,58b,97s stack positions out of 5000i,500n,10000p,200000b,50000s
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No pages of output.

‎bash/exercise-template/Q1-simple/paper.tex

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\documentclass{plain}
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\author{Sushant Mahajan}
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\date{28th August, 2013}
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\title{Tex2Pdf}
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\begin{document}
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\maketitle
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\newpage
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\section{Simple Section}
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\textbf{This converts to bold}
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\end{document}
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‎bash/exercise-template/Q1-simple/tcd.sh

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#!/bin/bash
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# Timed cd
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# A student has 3 lab courses: CS599, CS699, CS799 with the following
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# schedule:
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# CS599: Mon 2-5pm
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# CS699: Wed 2-5pm
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# CS799: Fri 2-5pm
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# The student has 3 sub-directories CS599, CS699, CS799 in the current
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# directory
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# Write a script to take two arguments:
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# Argument-1: day of the week in 3-letter capitalized format
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# (e.g. Wed, Fri, Sat, etc.)
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# Argument-2: hour of the day in 24-hour format (0-23)
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# The script should change directory to the correct directory
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# depending on the time
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# The script should print an appropriate error message if it does not
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# get exactly two arguments
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# If the time window does not match any of the lab timings, then the
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# script should not change directory
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‎bash/exercise-template/Q1-simple/tex2pdf-a.sh

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#/bin/bash
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# This program should compile the latex file given as argument, a tex
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# file assumed to be in the current/working directory. And it should
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# tar-gzip the entire current directory (from the current directory)
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# to a tgz file called paper.tgz. It should then move the paper.tgz
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# file to /tmp.
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‎bash/exercise-template/Q1-simple/tex2pdf-b.sh

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#/bin/bash
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# This program should compile the latex file given as argument, a tex
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# file assumed to be in the current/working directory. And if the
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# latex compilation succeeds, it should tar-gzip the entire current
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# directory (from the current directory) to a tgz file called
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# paper.tgz. It should then move the paper.tgz file to /tmp.
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‎bash/exercise-template/Q1-simple/tex2pdf-c.sh

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#/bin/bash
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# This program should compile the latex file given as argument. The
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# tex file can be in any directory; its full path name or relative
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# path name may be given as argument. And if the latex compilation
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# succeeds, it should tar-gzip the entire directory in which the latex
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# file resides, from the parent directory, to a tgz file. The name of
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# the tgz file should be <dirname>.tgz where <dirname> is the name of
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# the directory in which the latex file resides. It should then move
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# the tgz file to /tmp.

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