ࡱ> q` >bjbjqPqP .::6%       * R5R5R585l5|* rK~7~7"777777JJJJJJJ$MhOJ 97799J  77K"DDD9 7 7JD9JDD:}I  aJ7r7 \/R5?J J6K<rKJRPRC<PaJP aJx7@8rD8\9777JJDX777rK9999* * * *4* * * 4* * *        Guide to Linux+ (2nd Edition) ISBN 0-619-21621-2 End of Chapter Solutions Chapter 8 Solutions Review Questions Because Standard Error and Standard Ouput represent the results of a command and Standard Input represents the input required for a command, only Standard Error and Standard Ouput can be redirected to/from a file. True or False? Answer: False Before a user-defined variable can be used by processes that run in subshells, that variable must be __________. imported validated by running the env command exported redirected to the BASH shell Answer: c The alias command can be used to make a shortcut to a single command. True or False? Answer: True Which of the following files is always executed immediately after a user logs in to a Linux system and receives a BASH shell? /etc/profile ~/.bash_profile ~/.bash_login ~/.profile Answer: a Which command could you use to see a list of all environment and user-defined shell variables as well as their current values? ls /var env set echo Answer: c Every if construct begins with if and must be terminated with? end endif stop fi Answer: d Which of the following will display the message welcome home if the cd /home/user1 command is successfully executed? cd /home/user1 && echo welcome home cat welcome home || cd /home/user1 cd /home/user1 || cat welcome home echo welcome home && cd /home/user1 Answer: a The current value for the HOME variable is displayed by which of the following commands? (Choose all that apply.) echo HOME= echo ~ echo $HOME echo ls HOME Answer: b, c Which of the following file descriptor numbers represents stdout? 2 0 1 3 Answer: c Which of the following operators reverses the meaning of a test statement? #! -o -a ! Answer: d What would be the effect of using the alias command to make an alias for the date command named cat in honor of your favorite pet? It cannot be done as there already is an environment variable cat associated with the cat command. It cannot be done as there already is a command cat on the system. When you use the cat command at the command prompt with the intention of viewing a text file, the date appears instead. There is no effect until the alias is imported as it is a user-declared variable. Answer: c How do you indicate a comment line in a shell script? There are no comment lines in a shell script. Begin the line with #!. Begin the line with !. Begin the line with #. Answer: d You have redirected Standard Error to a file called Errors. You view the contents of this file afterward and notice that there are six error messages. After repeating the procedure, you notice that there are only two error messages in this file. Why? After you open the file and view the contents, the contents are lost. The system generated different Standard Ouput. You did not append the Standard Error to the Error file and as a result, it was overwritten when the command was run a second time. You must specify a new file each and every time you redirect as the system creates the specified file by default. Answer: c The sed and awk commands are filter commands commonly used to format data within a pipe. True or False? Answer: True What is wrong with the following command string ls /etc/hosts >listofhostfile? Nothing is wrong with the command. The file descriptor was not declared; unless 1 for Standard Ouput or 2 for Standard Error is indicated, the command will fail. The ls command is one of the commands that cannot be used with redirection; you must use | to pipe instead. The file listofhostfile will always only contain Standard Error as a file descriptor was not declared. Answer: a Which of the following is not necessarily generated by every command on the system? (Choose all that apply.) Standard Input Standard Deviation Standard Ouput Standard Error Answer: a, b Which construct can be used in a shell script to read Standard Input and place it in a variable? read sum verify test Answer: a A variable identifier must _________. not begin with a number not begin with a capital letter start with a number start with an underscore _ Answer: a What does >> accomplish when entered on the command line after a command? It redirects both Standard Error and Standard Ouput to the same location. It does not accomplish anything. It redirects Standard Error and Standard Input to the same location. It appends Standard Ouput to a file. Answer: d Consider the following shell script: echo -e What is your favorite color?--> \c read REPLY if [ $REPLY = red o $REPLY = blue ] then echo The answer is red or blue. else echo The answer is not red nor blue. fi What would be displayed if a user executes this program and answered Blue when prompted? The answer is red or blue. The answer is not red nor blue. The code would cause an error. The answer is red or blue. The answer is not red nor blue. Answer: b Hands-on Projects Project 8-1 Step 1: Not available. Step 2: Not available. Step 3: Yes as the out put of the ls command is shown for the first two files and Standard Error is generated as the third file does not exist. Step 4: No Standard Ouput has been redirected, but Standard Error generated by the lack of the sample3 file still is displayed to the default location as it has not been redirected. Step 5: The contents are the redirected output of the ls command previously displayed to the screen in Step 3. Step 6:Standard Ouput is once again there, but there is no Standard Error as it has been redirected. Step 7: The Standard Error generated by the lack of the file Sample 3; the previous contents were deleted when the command was run as the file to which Standard Error was being redirected already existed. Step 8:No, both have been redirected to files. Step 9: The file named file contains the Standard Ouput of the ls command that was redirected to it. Step 10: The file named file2 contains the redirected Standard Error of the ls command. Step 11: No, both have been redirected. Step 12: It contains both the standard out put and Standard Error of the ls command, which were redirected to it. Standard Error was redirected to the same location as Standard Ouput. Step 13: No, both have been redirected. Step 14: Standard Error and Standard Ouput as Standard Ouput was redirected to the same location as Standard Error and Standard Error was redirected to the file named file2. Step 15: Not available. Step 16: The date and time the date command above was run in Step 15. Step 17: Not available. Step 18: The date and time the date command above was run in Step 15 followed by the date and time the date command above was run in Step 17. Step 19 : Too many arguments for the tr command. This is because it translated but had no way of knowing where to store output as it treated /etc/hosts as an option. Step 20: Now that you have given it a redirection to a file, it will use the two arguments and store output to /etc/hosts. Step 21: Not available. Project 8-2 Step 1: Not available. Step 2: It pipes the Standard Ouput of the cat command to the more command. It differs as one of the commands uses Standard Input. Step 3: Seven lines. Because the filename it normally needs was replaced by the piped Standard Ouput of the previous command uses as Standard Input. Step 4: The same output as in Step 3 but this time with all the small ts translated to capital Ts as the previous output sent to the screen this time was sent to the tr command and the results of this displayed to the screen.. Step 5: The output from Step 4 but this time in reverse sort order as the output sent to the screen in Step 4 was this time piped to the sort command as input. Step 6: The same as in Step 5 because the output was not only sent to the screen but a copy simultaneously sent to the file file; thus, when you cat file you see the same output as was displayed to the screen. Step 7: Seven is the number of lines in the file file. The seven lines from /etc/inittab that contain tty with all the lower case ts changed to capital Ts sorted in reverse alphabetical order because the command string generated this and copied the output to the file file. Step 8: The command changed the tty strings to TTY only on lines that contain the pattern tty. This could be obtained by using the cat /etc/inittab | grep tty | tr ty TY command, but sed is easier and only changes strings of tty and not individual t and y characters. Step 9: The command displays the first and third colon-delimited fields of lines that contain tty in /etc/inittab. Step 10: Not available. Project 8-3 Step 1: Not available. Step 2: Not available. Step 3: Smaller as it is only the user variables not all the variables for the shell. Step 4: The words hello there appear on the screen as the new command prompt. Step 5: The regular command prompt that preexisted Hello There. You would have to export it. Step 6: The first line displays the question to the screen not showing a new line after. The second line reads the response. The third line tests this response for a true value of y and if it is true, the next line calls the fifth line that changes the command prompt to Hello There, and the last line ends the if statement. Step 7: Hello there because when you logged in, you ran .bash_profile and the chunk of code you edited into it ran; when it tested y as true, it changed the prompt to hello there. Step 8: Not available. Step 9: Not available. Step 10: Yes as it is a user variable. Step 11: No as it is a user variable and not exported yet. Step 12: Yes it is this time because it was exported and is now available. Step 13: Not available. Step 14: No as the variable you set was lost when you logged out. When you logged in, .bash_profile ran and set all the variables, but MYVAR was not one of them. Step 15: Not available. Step 16: Not available. Step 17: Yes it was as when you logged in, .bash_profile ran and set all the variables, and MYVAR was one of them. Step 18: alias cp='cp -i' alias dwp='date;who;pwd' alias l.='ls -d .* --color=tty' alias ll='ls -l --color=tty' alias ls='ls --color=tty' alias mv='mv -i' alias rm='rm -i' alias vi=vim alias which='alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde' Step 19: Creates the alias asample that changes to the etc directory, views the host file, changes to the users home directory and does a classified listing of it contents. Step 20: It ran the commands in Step 19 because you executed the appropriate shell alias.. Step 21: Not available. Project 8-4 Step 1: Not available. Step 2: Not available. Step 3: Not available. Step 4:. -rw-r--rYes, it executed and the /t is a horizontal tab and /a is a system speaker beep. Step 5: Permission denied as you do not have x. Step 6: Yes because you added the x or execute permission to it for the user so not it is rwxr--r--. Step 7: Not available. Project 8-5 Step 1: Not available. Step 2: Not available. Step 3: Not available. Step 4: Not available. Step 5: Yes. Step 6: Not available. Step 7: Not available. Step 8: Yes. Step 9: Yes because the line adding to the database appends the information. Step 10: Not available. Step 11: You must enter either the letter a or s, because the script and its case statement are not looking for y but a or s. Step 12: No because the case statement tests for a or A. Step 13: No because the case statement tests for s or S. Step 14: Not available. Step 15: Not available. Step 16: Yes because you ran a script that copies the file and made the directory to copy it to. Step 17: The file was copied but the directory not made as it already exists being created in Step 16. Step 18: Not available. Discovery Exercises Discovery Exercise 1 a)export NEWHOME=$HOME b)alias mm=mount | grep ext2 c)grep host /etc >file1 2&1 d)set | grep bash | sort e)cat /etc/passwd | awk F: {print $1} > users Discovery Exercise 2 The command translates all lower case as to capital As in the file /etc/hosts then sorts all the lines in reverse order and formats the file for printing double-spaced. Discovery Exercise 3 Redirect the Standard Error to a file, view the file using the cat command, and redirect the Standard Output to the desired place. Discovery Exercise 4 Test r /etc/hosts **** but then so is [ -r /etc/hosts ] correct [ -r /etc/hosts a -x /etc/hosts ] [ $TEST=success ] [ $TEST eq $RESULT ] [ $TEST=success a f /etc/hosts ] [ $TEST=success o $TEST eq 5 o $TEST=$RESULT ] Discovery Exercise 5 First two lines are comments, the next three are an if statement that says if the hidden file bashrc exists in the users home directory, then execute it. The next three set environment variables, the path statement, shell, and user, and the last line exports these variables so they can be used in subshells. 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