ࡱ> vxuE@ &bjbj %F       ###8#, $LGb$b$x$x$x$x$ $ $2=4=4=4=:n=BF$JR!MbF &x$x$&&F  x$x$F8(8(8(&R x$ x$2=8(&2=8(8()9   <x$V$ P5D #j&;:=$F0G<ML'Mt<    M <X$0$"8($%$$$FFd#$"(#Guide to Linux Installation and Administration, 2e Chapter 11 Solutions Review Questions Name four shell scripts that are included on a standard Linux system, and describe the use of each one. Examples include all the files in /etc/rc.d/init.d, /etc/rc.d/rc.local, /etc/rc.d/rc.sysinit, xinitrc, bash_profile, /etc/profile, Xsession, and similar initialization scripts. The first line of a standard shell script must contain: c. The path and filename of the shell used to execute the script In order to be executed by any user (including root), a shell script must have the _____ file permission set. a. Execute Which of these statements contains a standard positional variable? b. gzip $1 Which two commands involve a test value of true or false? a. if and while The test command is equivalent to using square brackets around a test expression, but the test command is less frequently used. True Briefly explain why comments are an important part of any shell script. They tell other system administrators what a shell script is for and how to interact with it; they also remind the author of these facts later on! Describe the difference in control methods between a for loop and a while loop. A for loop repeats statements a fixed number of times; a while loop repeats statements until a condition is met, which is typically not predictable and may last forever. A loop beginning with the command for i in 2 4 6 8 will be executed how many times? b. Four Name three non-shell scripting languages. Include a statement on the use, characteristics, or author of each one. The most popular are listed in Table 11-2; many others are used as well. CGI is popular for which of the following purposes? b. Interfacing between scripts and Web servers Briefly explain the difference in time specification formats for the at and crontab commands. at uses keywords like now, hours, minutes, days, tomorrow, today; crontab uses a numeric system based on five fields representing minutes, hours, day of month, month of year, and day of week. The daemon that manages commands submitted using at and cron are: c. atd and crond When using the at command interactively to enter commands scheduled for future execution, you indicate that you have finished entering commands by pressing: a. Ctrl+D The batch command is used to schedule jobs so that: c. The system will not be overloaded with scheduled tasks. A simple method for root to schedule recurring system administration tasks is to: b. Add a script to a directory such as /etc/cron.daily or /etc/cron.weekly. The output of a cron job is normally sent via ______ to the user who submitted the cron job or to the user defined by the _____ variable within the file containing the cron job. a. e-mail, MAILTO Name, in order from left to right, the fields of the crontab time specification, giving the range of valid numeric values for each one. Minute of the hour: from 0 to 59. Hour of the day: from 0 to 23. Day of the month: from 0 to 31 Month of the year: from 0 to 12 Day of the week: from 0 to 7 Output from a command executed as part of a cron job cannot be redirected to a file using standard redirection operators because the environment in which the cron job was created is unlikely to exist when the cron job is executed. False The _____ file can include a username in order to deny that user access to the crontab command. b. /etc/cron.deny Name the two separate commands that can be used instead of at -l and at -d. atq and atrm Name an advantage of using the make config kernel configuration utility. You can use input redirection to feed responses to it for faster kernel configuration; this is used only by advanced users. The make command acts based on The preferred method of installing kernel source code is to include Kernel Development as an option during the initial installation of Linux. a. This is true because there are so many dependent packages that it is a lot of work to manually install them all. A newly compiled kernel created using the make bzImage command is initially stored in which directory? d. /usr/src/linux-2.4/arch/i386/boot Hands-on Projects  Project 11-1 Enter ./fileinfo to execute the command without any parameters. What happens? What result is returned by the test in the second line of the script? The message appears You must include a filename on the command line. The result returned by the test is True, because the test is $# less than 1 is truewith no filenames on the command line, the value of $# is 0. 10. What other methods could you use to test for the presence of a command-line parameter? What would happen if you removed the if/then test but didnt include any filenames on the command line? You could use different tests from table 11-1, such as le. If you removed the if/then test, the for loop would count zero times and the statement block between do and done would not be executed at all. 11. Enter ./fileinfo /etc/termcap to execute the command with a parameter. What happens? How many times was the for loop executed? Once Execute the command with the parameter shown here: ./fileinfo /etc/m*conf What happens? How could you alter the script to test the validity of each filename that was provided on the command line before using the wc command? (Hint: Use the -r file test from Table 11-1.) Enclose everything currently between do and done in the for loop inside another if/then statement that used the test [ $i r ];  Project 11-2 8. Press Ctrl+D to finish entering the commands you want to automate. What message do you see? What time is specified? Is it a relative time or an absolute time based on the time specification that you entered? You see the indication, then an absolute time based on the specification you gave in the at command (15 minutes after that time). 9. Enter the atq command. What information do you see about the job you just entered? What is the job number? You see a job number, the time it will be executed, and your user name. The exact job number will differ on each system.  Project 11-3 4. Describe the time specification that you entered in the du_job file. The command will be executed every day of the year at 2:30 in the morning. 5. What problem could occur with the command entered in the du_job file because you are working as a regular user? Your regular user cannot access other users home directories, so the results in /tmp/output will only include your own home directory. 15. Enter crontab -r to remove the crontab file for your regular user account. What happens? Why? You are not allowed to use crontab as this regular user because of the cron.deny entry. This is true even though your previously-submitted job is still in the system. Case Projects 1. One of the cron jobs submitted by a user looks like this: * * * * 1-5 grep html `ls -r /` > ~/Webpages Describe what this command does and explain why it is causing problems for every user on the system. This command searches a listing of all mounted file systems for all filenames containing the string html and stores that list in the Webpages file in the users home directory. This is done once per minute, 24 hours per day, Monday through Friday. The system has slowed to a crawl if indeed it hasnt crashed. 3. After working out some of the automation issues with the Starwood staff, they ask you about using their digital video cameras with Linux. The cameras use a video interface called FireWire, or IEEE 1394. The FireWire interface of the cameras is based on an OHCI-1394 chipset manufactured by NEC. Launch the xconfig kernel configuration utility and find out whether Linux supports this chipset. Click on the IEEE-1394 Firewire Support button. Then choose the Help button next to the OHCI-1394 Support line to see that the Texas Instruments and NEC chipsets are supported. 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