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Tutorial3: Advanced File Management / Quoting Special Characters

29 bytes added, 10:05, 14 January 2021

→‎INVESTIGATION 2: FILENAME EXPANSION

<div style="font-family:courier;margin-left:50px;font-weight:bold;">abc.txt def.text hij.TxT 1a4.txt 123.TXT 456.txt 6u9.txt

ab2.html 1234.txt abcdef.txt abcde.txt </div>

<ol><li value="4">Before proceeding, let's run a '''checking script''' to make certain that you created these regular files correctly. </li><li>Issue the following Linux command: bash /home/murray.saul/scripts/week3-check-3 If you encounter errors, then make corrections (eg. viewing directory contents, check for filename syntax, case sensitivity, missing files, etc., and then re-run the checking script until you receive a congratulations message, and continue in this section. ATTENTION: Learning to fix your mistakes by issuing Linux commands may be required if you make mistakes in your Assignment #1! You have now been WARNED!</span<> <li>Issue the '''ls''' command to get a listing of files in your commands 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>Issue the following Linux command: ls ???.txt Write down the expected output on paper, then issue the command to check your answer. </li><li>Issue the following Linux command: ls ?????.txt Write down the expected output on paper, then issue the command to check your answer. </li><li>Issue the following Linux command: ls ??????.txt Write down the expected output on paper, then issue the command to check your answer. </li><li>Issue the following Linux command: ls [0-9].txt Write down the expected output on paper, then issue the command to check your answer. Did the command work? What does this teach you about the character class [ ] symbol? </li><li>Issue 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>Issue 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>Issue 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>Issue 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>Issue 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>Issue 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] Write down the expected output on paper, then issue the command to check your answer. <li>Change to the '''commands''' directory using an '''absolute''' pathname. </li><li>Issue a Linux command to confirm that you are now in the '''commands''' directory. </li><li>Issue the following Linux command: 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: 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? </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>

= INVESTIGATION 3: QUOTING SPECIAL CHARACTERS =

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