From d305a9b065ad24fdae0da47a6d8a7140cd8e0a43 Mon Sep 17 00:00:00 2001
From: Puneeth Chaganti
Date: Fri, 10 Jun 2011 15:19:03 +0530
Subject: ult: Fix bug in slides.

s/marks.txt/marks1.txt at some instances.
---
 ult/ult.tex | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

(limited to 'ult')

diff --git a/ult/ult.tex b/ult/ult.tex
index 62117eb..e1feb3d 100644
--- a/ult/ult.tex
+++ b/ult/ult.tex
@@ -679,7 +679,7 @@
 \begin{frame}[fragile]
   \frametitle{Redirection and Piping}
   \begin{lstlisting}
-    $ cut -d " " -f 2- marks.txt \
+    $ cut -d " " -f 2- marks1.txt \
     > /tmp/m_tmp.txt
     $ paste -d " " students.txt m_tmp.txt
   \end{lstlisting} % $
@@ -687,7 +687,7 @@
   or
 
   \begin{lstlisting}
-    $ cut -d " " -f 2- marks.txt \
+    $ cut -d " " -f 2- marks1.txt \
     | paste -d " " students.txt -
   \end{lstlisting} % $
 
@@ -745,10 +745,10 @@
   \item Error message is redirected, in the second case
   \end{itemize}
   \begin{lstlisting}
-    $ cut -d " " -c 2- marks.txt \
+    $ cut -d " " -c 2- marks1.txt \
       > /tmp/m_tmp.txt
 
-    $ cut -d " " -f 2- marks.txt 1> \
+    $ cut -d " " -f 2- marks1.txt 1> \
       /tmp/m_tmp.txt 2> /tmp/m_err.txt
   \end{lstlisting} % $
   \begin{itemize}
@@ -763,7 +763,7 @@
 \begin{frame}[fragile]
   \frametitle{Piping}
   \begin{lstlisting}
-    $ cut -d " " -f 2- marks.txt \
+    $ cut -d " " -f 2- marks1.txt \
       | paste -d " " students.txt -
   \end{lstlisting} % $
   \begin{itemize}
@@ -852,7 +852,7 @@
   \item Command below prints student marks, sorted by name
   \end{itemize}
   \begin{lstlisting}
-    $ cut -d " " -f 2- marks.txt \
+    $ cut -d " " -f 2- marks1.txt \
       | paste -d " " students.txt - \
       | sort
   \end{lstlisting} % $
@@ -868,7 +868,7 @@
   \item The command below sorts based on marks in first subject
   \end{itemize}
   \begin{lstlisting}
-    $ cut -d " " -f 2- marks.txt \
+    $ cut -d " " -f 2- marks1.txt \
       | paste -d " " students.txt -\
       | sort -t " " -k 2 -rn
   \end{lstlisting} % $
@@ -887,7 +887,7 @@
   \item Command below searches \& shows the marks of Anne alone 
   \end{itemize}
   \begin{lstlisting}
-    $ cut -d " " -f 2- marks.txt \
+    $ cut -d " " -f 2- marks1.txt \
     | paste -d " " students.txt - 
     | grep Anne
   \end{lstlisting} % $
@@ -902,7 +902,7 @@
   \item \texttt{-i} for case-insensitive searches
   \end{itemize}
   \begin{lstlisting}
-    $ cut -d " " -f 2- marks.txt \
+    $ cut -d " " -f 2- marks1.txt \
     | paste -d " " students.txt - 
     | grep -i Anne
   \end{lstlisting} % $
@@ -911,7 +911,7 @@
   \item To see everyone's marks except Anne's
   \end{itemize}
   \begin{lstlisting}
-    $ cut -d " " -f 2- marks.txt \
+    $ cut -d " " -f 2- marks1.txt \
     | paste -d " " students.txt - 
     | grep -iv Anne
   \end{lstlisting} % $
@@ -989,7 +989,7 @@
   \begin{lstlisting}
     #!/bin/bash
     mkdir ~/marks
-    cut -d " " -f 2- marks.txt \
+    cut -d " " -f 2- marks1.txt \
     | paste -d " " students.txt - \
     | sort > ~/marks/results.txt
   \end{lstlisting} % $
@@ -1020,7 +1020,7 @@
   \begin{lstlisting}
     #!/bin/bash
     mkdir ~/marks
-    cut -d " " -f 2- marks.txt \
+    cut -d " " -f 2- marks1.txt \
     | paste -d " " students.txt - \
     | sort > ~/marks/results.txt
     echo "Results generated."
@@ -1036,7 +1036,7 @@
   \begin{lstlisting}
     #!/bin/bash
     mkdir ~/marks
-    cut -d " " -f 2- marks.txt \
+    cut -d " " -f 2- marks1.txt \
     | paste -d " " students.txt - \
     | sort > ~/marks/$1
     echo "Results generated."
-- 
cgit 


From 58630bcb4334866b399da831c72e32c6674cd996 Mon Sep 17 00:00:00 2001
From: Puneeth Chaganti
Date: Fri, 10 Jun 2011 16:28:14 +0530
Subject: ult: Add example for iterating over range of numbers.

---
 ult/handout.rst | 9 +++++++++
 ult/ult.tex     | 6 ++++++
 2 files changed, 15 insertions(+)

(limited to 'ult')

diff --git a/ult/handout.rst b/ult/handout.rst
index b72dbdc..a1ea9fb 100644
--- a/ult/handout.rst
+++ b/ult/handout.rst
@@ -1910,6 +1910,15 @@ dummy or a loop variable. It can then be used to refer to the element of
 the list that is currently being dealt with. We could, obviously, use
 something as lame as ``i`` in place of ``animal``.
 
+To generate a range of numbers and iterate over them, we do the following. 
+
+::
+
+    for i in {5..10}
+    do
+    echo $i
+    done
+
 Now, we use a ``for`` loop to list the files that we are interested in.
 
 ::
diff --git a/ult/ult.tex b/ult/ult.tex
index e1feb3d..613409f 100644
--- a/ult/ult.tex
+++ b/ult/ult.tex
@@ -1211,6 +1211,12 @@
   \item Loop over the list; \texttt{animal} is a dummy variable
   \item Echo value of \texttt{animal} ---  each name in list
   \end{itemize}
+  \begin{lstlisting}
+    for i in {10..20}
+    do 
+    echo $i
+    done
+  \end{lstlisting} % $
 \end{frame}
 
 \begin{frame}[fragile]
-- 
cgit 


From 638d6b456a95c64a71d0584a89404af1a1c2e8dd Mon Sep 17 00:00:00 2001
From: Puneeth Chaganti
Date: Fri, 10 Jun 2011 16:28:35 +0530
Subject: ult: Add content on shell variables and comments.

---
 ult/handout.rst | 35 +++++++++++++++++++++++++++++++++++
 ult/ult.tex     | 15 +++++++++++++++
 2 files changed, 50 insertions(+)

(limited to 'ult')

diff --git a/ult/handout.rst b/ult/handout.rst
index a1ea9fb..5ef762a 100644
--- a/ult/handout.rst
+++ b/ult/handout.rst
@@ -1785,6 +1785,41 @@ So, these are all the paths that are searched, when looking to execute a
 command. If we put the results.sh script in one of these locations, we
 could simply run it, without using the ``./`` at the beginning. 
 
+Variables
+---------
+
+As expected, it is possible to define our own variables inside our shell
+scripts. For example,
+
+::
+
+    name="FOSSEE"
+
+creates a new variable ``name`` whose value is ``FOSSEE``. To refer to this
+variable, inside our shell script, we would refer to it, as ``$name``.
+**NOTE** that there is no space around the ``=`` sign. 
+
+::
+
+    ls $name*
+
+It is possible to store the output of a command in a variable, by enclosing
+the command in back-quotes. 
+
+::
+
+    count=`wc -l wonderland.txt`
+
+saves the number of lines in the file ``wonderland.txt`` in the variable
+count. 
+
+Comments
+--------
+
+The ``#`` character is used to comment out content from a shell script.
+Anything that appears after the ``#`` character in a line, is ignored by
+the bash shell. 
+
 Control structures and Operators
 ================================
 
diff --git a/ult/ult.tex b/ult/ult.tex
index 613409f..a94dc14 100644
--- a/ult/ult.tex
+++ b/ult/ult.tex
@@ -1012,6 +1012,21 @@
   \end{itemize}
 \end{frame}
 
+\begin{frame}[fragile]
+  \frametitle{Variables \& Comments}
+  \begin{lstlisting}
+    $ name=FOSSEE
+    $ count=`wc -l wonderland.txt`
+    $ echo $count # Shows the value of count
+  \end{lstlisting} % $
+  \begin{itemize}
+  \item It is possible to create variables in shell scripts
+  \item Variables can be assigned with the output of commands
+  \item \alert{NOTE:} There is no space around the \texttt{=} sign
+  \item All text following the \texttt{\#} is considered a comment
+  \end{itemize}
+\end{frame}
+
 \begin{frame}[fragile]
   \frametitle{\texttt{echo}}
   \begin{itemize}
-- 
cgit 


From 0bb8028c7edaf21c4f057af5b49758635f9c5fee Mon Sep 17 00:00:00 2001
From: Puneeth Chaganti
Date: Fri, 10 Jun 2011 16:29:04 +0530
Subject: ult: Add exercise to read man of expr command.

---
 ult/exercises.rst | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'ult')

diff --git a/ult/exercises.rst b/ult/exercises.rst
index 6f0f052..e8aede3 100644
--- a/ult/exercises.rst
+++ b/ult/exercises.rst
@@ -73,7 +73,9 @@ Session-2
 
 0. Read through the section ``REGULAR EXPRESSIONS`` in ``man grep``
 
-1. grep the marks of the students who scored above 75 in atleast one
+#. 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'
-- 
cgit 


From 14c806bf85ac4cf2557fb7c850b15272fb768899 Mon Sep 17 00:00:00 2001
From: Puneeth Chaganti
Date: Fri, 10 Jun 2011 16:31:23 +0530
Subject: ult: Fix exercise question.

---
 ult/exercises.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'ult')

diff --git a/ult/exercises.rst b/ult/exercises.rst
index e8aede3..04df5ce 100644
--- a/ult/exercises.rst
+++ b/ult/exercises.rst
@@ -57,7 +57,7 @@ Session-1
 
 #. Change ownership of the file ``test`` to some other user (if exists).
 
-#. Count the number of files in a directory. 
+#. 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``.
-- 
cgit