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Tutorial3: Advanced File Management / Quoting Special Characters

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<ol><li value="4">To verify that you properly created those files, issue the following: ~~bash /home/murray.saul/myscripts~~~uli101/week3-check-3 If you encounter errors, then make corrections (eg. '''viewing directory contents''', '''check for correct filename syntax''', '''case sensitivity''', '''missing files''', '''files in the wrong location''', etc.) and then re-run the checking script until you receive a congratulations message, and then continue with this investigation. '''ATTENTION''': Learning to '''fix your mistakes''' by issuing Linux commands may be required if you make mistakes in your Assignment #1. This advice should help to prevent '''wasting time''' completing later sections of your assignment #1. <li>Issue the '''ls''' command to get a listing of files in your ''examples'' directory. The output should look identical to the diagram displayed below. You can refer to this listing to see all files so you can then predict the output from Linux commands that use filename expansion symbols. [[Image:listing-1.png|left|650px|thumb|]] </li><li>What do you think the output will be from the following Linux command? ls ???.txt '''Write down the expected output''' on paper, then '''issue the command''' to check your answer. </li><li>What do you think the output will be from the following Linux command? ls ?????.txt '''Write down the expected output''' on paper, then '''issue the command''' to check your answer. </li><li>What do you think the output will be from the following Linux command? ls ??????.txt '''Write down the expected output''' on paper, then '''issue the command''' to check your answer. </li><li>What do you think the output will be from the following Linux command? ls [0-9].txt '''Write down the expected output''' on paper, then '''issue the command''' to check your answer.br>Did the command work? What does this teach you about the character class [ ] symbol? </li><li>What do you think the output will be from the following Linux command? ls [0-9][0-9][0-9].txt '''Write down the expected output''' on paper, then '''issue the command''' to check your answer. </li><li>What do you think the output will be from the following Linux command? ls [a-z][a-z][a-z].txt '''Write down the expected output''' on paper, then '''issue the command''' to check your answer. </li><li>What do you think the output will be from the following Linux command (using character class with UPPERCASE letters)?: ls [A-Z][A-Z][A-Z].txt '''Write down the expected output''' on paper, then '''issue the command''' to check your answer. </li><li>What do you think the output will be from the following Linux command (using character class using alpha-numeric characters)? ls [a-zA-Z0-9][a-zA-Z0-9][a-zA-Z0-9].txt '''Write down the expected output''' on paper, then '''issue the command''' to check your answer. </li><li>What do you think the output will be from the following Linux command? ls *.txt '''Write down the expected output''' on paper, then '''issue the command''' to check your answer. Did ALL text files get listed? Why not? </li><li>What do you think the output will be from the following Linux command? ls *.[tT][xX][tT] '''Write down the expected output''' on paper, then '''issue the command''' to check your answer. Did ALL text files get listed this time? If so, why? </li><li>'''NOTE:''' We have just been using filename expansion symbols just with the ls command. Filename expansion symbols can be used for ANY Linux file management command (e.g. '''cat''', '''more''', '''less''', '''cp''', '''mv''', '''rm''', '''ls''', etc.). Let's get some practice issuing these other Linux file management commands. </li><li>Issue the following Linux command: file *.[tT][xX][tT] What is the purpose of this command? Which files are contained in this output? <li>[[Image:dir12.png|right|350px|thumb|]]Change to the '''commands''' directory using an '''absolute''' pathname (use the diagram on right-side for reference). </li><li>Issue a Linux command to confirm that you are now in the '''commands''' directory. </li><li>Issue the following Linux command (lowercase "l" NOT the number "1"): cp /bin/l*   . View the contents of the contents directory. What did this command do? </li><li>Issue the following Linux command: rm * View the contents of the contents directory. What did this command do? </li><li>Issue the following Linux command (lowercase "l" NOT the number "1"): cp /bin/l?   . View the contents of the contents directory. What did this command do? </li><li>Issue the following Linux command: rm l[!s] View the contents of the contents directory. What did this command do? </li><li>Use a text editor (nano or vi) to create the file called '''ab''' in the '''commands''' directory that contains the line of text below, and then save editing changes to this file: This is file ab </li><li>Use a text editor (nano or vi) to create the file called '''cd''' in the '''commands''' directory that contains the line of text below, and then save editing changes to this file: This is file cd </li><li>Use a text editor (nano or vi) to create the file called '''ef''' in the '''commands''' directory that contains the line of text below, and then save editing changes to this file: This is file ef </li><li>Issue the following Linux command: cat ?? View the contents of the contents directory. What did this command do? Why does the output look strange? '''NOTE:''' Press the keys '''ctrl-c''' to return to the shell prompt. </li><li>Issue the following Linux command: cat [!l][!s] View the contents of the contents directory. What did this command do? Does the output look better? If so, why? </li></ol>

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