MCT260-Operating Systems I Operating Systems I Using Text Editors

MCT260-Operating Systems I 2 Primary Learning Objective Manipulate Text Files Using Built-in Text Editors

MCT260-Operating Systems I 3 Specific Learning Objectives Identify and define the key terms used with text editors Use text editors built into the operating system to create text files Create a text file using the COPY CON command View a text file using the TYPE command Use redirection operators in CLI

MCT260-Operating Systems I 4 Text Files Letters and simple punctuation that makes up words, sentences, and paragraphs. Typically in IT, the term text refers to text stored as ASCII code (that is, without any formatting). Objects that are not text include graphics, numbers (if they're not stored as ASCII characters, and program code.

MCT260-Operating Systems I 5 ASCII Stands for American Standard Code for Information Interchange The original standard ASCII coding scheme used 7 bits (128 characters) to represent all upper &lower case letters, 0-9, punctuation, and special control characters (See page 97) Extended ASCII uses 8 bits (256 characters) added foreign-language, graphical & scientific characters. ( É, û, ß, µ)

MCT260-Operating Systems I 6 Other Character Sets EBCDIC (pronounced "ehb-suh-dik" ) is a binary code for alphabetic and numeric characters that IBM developed for its larger operating systems. ANSI’s first 128 characters are the same as ASCII but the second 128 depends are the language supported Unicode uses 16 bits (65,536 characters) of which about 21,000 are Chinese ideographs

MCT260-Operating Systems I 7 Built-In Text Editors Notepad – Create or edit text files without formatting. Used for batch files, in coding HTML and other programming languages. MS-DOS Editor – Create or edit files using the EDIT.COM command (actually a small application). Uses similar to Notepad. COPY CON – Create but not edit small files. WordPad – Like MS Word it uses formatting so the actual file size will be larger.

MCT260-Operating Systems I 8 Viewing Text Files from CLI Use MS-DOS Editor Use the TYPE command

MCT260-Operating Systems I 9 Using Redirection Operators In CLI, the OS expects input from the standard input device or keyboard and sends or directs output to the standard output device or monitor. To send output or input to/from a device other than the standard one, you redirect or change the destination/source with redirection operators Some of the redirection operators are output ( > ), input ( > )

MCT260-Operating Systems I 10 Output & Appending Redirection Operators Output is the greater than symbol ( > ) If you want to redirect output to a file/printer, specify the name of the file or printer after the symbol. If the filename exists, the file will be overwritten. dir > filename dir > prn To append, to add to an existing file use ( >> ). date >> filename

MCT260-Operating Systems I 11 Input Redirection Operator Although the OS expects the input to come from the keyboard, it can come from a file instead. Input is the less than symbol ( < ) If you want to redirect input to a process or command, specify the name of the file or printer after the symbol. Command < filename DEL One\*.* < y.txt

MCT260-Operating Systems I 12 Piping Output to the MORE Filter A filter is a command that can modify the output of another command. The MORE filter or command is an external command that displays a screen of output, pauses, and then displays “— More—” which permits you to continue when ready. The pipe operator ( | ) redirects the output produced by one command so that the output then becomes the input for another command. [command] | MORE TYPE syllabus.txt |MORE

MCT260-Operating Systems I 13 Summary Text Files ASCII and other character sets Built-In Text Editors Viewing Text Files from CLI Redirection Operators

MCT260-Operating Systems I 14 Homework Assignment Reading –Windows XP Textbook – pp –CLI Textbook - pp , Lab Exercise 7: Text Files Due Date: A Week from Next Tuesday