first commit

Qt programming/MyForm.cpp

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+#include "MyForm.h"
+MyForm::MyForm(QWidget *parent) : QWidget(parent)
+{
+    label = new QLabel(this); //set parent to this as parent is Myform object
+    label->setGeometry(30,0,50,80);
+
+    lineEdit = new QLineEdit(this); //set parent to this as parent is Myform object
+    lineEdit->setGeometry(30,80,80,20);
+
+    button = new QPushButton(this); //set parent to this as parent is Myform object
+    button->setGeometry(30,110,50,60);
+    button->setText("Click");
+
+    this->connect(button, // button generates signal
+            SIGNAL(clicked()), // signal was clicked
+            this, // recievr is form
+            SLOT(addTextToLabel()) //the slot that executes is addTextToLabel
+    );
+}
+void MyForm::addTextToLabel(){
+   this->label->setText( lineEdit->text() ); // on this from obj
+
+}
+
+
+

Qt programming/MyForm.h

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+#ifndef MyForm_H
+#define MyForm_H
+#include <QLabel>
+#include <QWidget>
+#include <QLineEdit>
+#include <QPushButton>
+
+class MyForm : public QWidget{
+    Q_OBJECT
+    public:
+        //declare pointers of QWidgets.
+        QLabel *label;
+        QPushButton *button;
+        QLineEdit *lineEdit;
+
+        /* Myfrom class's constructor with parent value 0, i.e form
+        * object will be the parent for all the widget objects inside it ..
+        * or simply QLabel, QPushbutton etc will be childs of MyForm object when created..
+        */
+        MyForm(QWidget *parent = 0);
+
+    private slots:
+        /*
+        *   A slot that will set the value of label to whatever was written inside QLineEdit.
+        */
+        void addTextToLabel();
+};
+#endif

Qt programming/README

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+Author:Nadeem Hilal
+Purpose:A simple application to show working of signal & slots.
+Description:Three QWidgets QLabel, QPushButton and QLineEdit,
+            whateever is typed inside the QLineEdit, after user clicks the QPushButton
+            the same text from the QLineEdit is Displayed on QLabel.
+
+How to compile the code to application on linux machine.
+    qmake-qt4, g++, must be installed on machine, and other qt4 packages required for Qt Development.
+1: Create a directory hello.
+2: Copy MyForm.h, MyForm.cpp, main.cpp into this  "hello" directory.
+3: cd into hello, the write below commands one by one.
+4: qmake-qt4 -project main.cpp
+5: qmake-qt4 hello.pro
+6: qmake-qt4
+7: make
+8: ./hello
+
+
+Enjoy :)

Qt programming/main.cpp

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+#include <QWidget>
+#include "MyForm.h"
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+    MyForm *form = new MyForm;
+    form->show();
+return app.exec();
+}

UnixShellScripts/areaOfCircle.sh

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+#!/bin/sh
+#Compute area of circle
+readonly pi=3.14;
+area(){
+    echo "scale=5; ${pi} * ( ${1} * ${1} ) " | bc
+}
+
+#script actually is interpreted from here
+echo "Enter the radius."
+read radius;
+areaIs=`area ${radius}`
+echo "The area of circle with radius ${radius} is: ${areaIs}"

UnixShellScripts/countToltalLinesInFile.sh

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+#!/bin/sh
+#Script that counts lines in the file passed.
+noOfLines=0;
+if test -f $1; then
+    while read line
+    do
+        noOfLines=$( echo " ${noOfLines} + 1" | bc )
+    done < $1
+    echo "The total no of lines are: ${noOfLines}"
+fi
+

UnixShellScripts/factorialOfNumberByRecurrsion.sh

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+#!/bin/sh
+#factorial using recurrsion
+factorial(){
+    if test $1 -eq 1; then
+        echo 1;
+    else
+        x=$(echo "$1 - 1" | bc)
+        echo "${1} * $(factorial $x)" | bc
+    fi
+}
+
+#script actually is interpreted from here
+echo "Enter the number"
+read number;
+echo "The factorial of ${number} is: $(factorial ${number})"

UnixShellScripts/readIstWordOf3rdLine.sh

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+#!/bin/sh
+lineCount=`wc -l $1 | cut -d ' ' -f1`
+if [ $lineCount -ge 3 ]; then
+    word=`head -3 $1 | tail -1  | cut -d ' ' -f1 `
+    echo "The ist word of third line is : ${word}"
+else
+    echo "No sufficient lines."
+fi

UnixShellScripts/readme.txt

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+hello my name is nadeem
+hello world
+hellosdsadasdsadsad
+sajdlkjsajda
+
+

UnixShellScripts/sumTwoNumbers.sh

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+#!/bin/sh
+#sum 2 numbers using function or without
+# sum(){
+#     echo " ${1} + ${2} "| bc
+# }
+
+#script actually is interpreted from here
+echo "Enter the ist number."
+read num1;
+echo "Enter the 2nd number."
+read num2;
+# sumIs=`sum ${num1} ${num2}`
+sumIs=$(echo "${num1} + ${num2}" | bc)
+echo "The sum of ${num1} + ${num2} = ${sumIs}"
+

UnixShellScripts/testEvenOdd.sh

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+#!/bin/sh
+#even odd
+#script actually is interpreted from here
+echo "Enter the number"
+read number;
+bool=$(echo "${number} % 2" | bc )
+if test $bool -eq 0; then
+    echo "The number ${number} is Even."
+else
+    echo "The number ${number} is Odd."
+fi

UnixShellScripts/testPrimality.sh

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+#!/bin/sh
+#Primality test
+#script actually is interpreted from here
+echo "Enter the number"
+read number;
+count=2;
+while test $count -lt $number;
+do
+    y=$(echo "${number} % ${count} " | bc)
+    if test $y -eq 0; then
+        echo "The number  ${number} is not prime"
+        break;
+    fi
+    count=$(echo "${count} + 1" | bc) #i++
+done
+
+if test $count -ge $number; then
+    echo "The number ${number} is Prime."
+fi