9: Using the Linux Shell in Software

Creating ANSI/AIM Code 128 in Software 9: Using the Linux Shell

9: Using the Linux Shell
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C alias mntflp= mount t vfat /dev/fd0 /media/floppy,mount |grep fd0,ls l /media/floppy D alias mntflp=mount t vfat /dev/fd0 /media/floppy;mount |grep fd0;ls l /media/floppy
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11 Which file descriptor refers to the text a command displays on the screen after the command has finished processing (Choose two) A B C D E stdin stdout stdscreen stdoutput stderr
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12 You want to send the standard output and the standard error from the tail /var/log/firewall command to a file named lastevents in the current directory Which command will do this A B C D /tail/var/log/firewall 1>lastevents 2>lastevents /tail/var/log/firewall >lastevents /tail/var/log/firewall 1>lastevents 2>&1 /tail/var/log/firewall 1&2>lastevents
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13 You want to send the contents of the logfiletxt file in the current directory to the sort command to sort them alphabetically and display them on the screen Which command will do this A B C D sort </logfiletxt sort i /logfiletxt sort </logfiletxt d screen sort </logfiletxt >screen
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14 You want to send the contents of the logfiletxt file in the current directory to the sort command to sort them alphabetically and display them on the screen Which command will do this A B C D cat /logfiletxt --sort cat /logfiletxt |sort </logfiletxt sort < |cat /logfiletxt cat /logfiletxt |sort
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15 You want to display on screen the sixth, seventh, and eighth words in any line of /var/log/ messages that has the term syslog in it Which of the following commands will do this A B C D cat /var/log/messages |awk /syslog/ {print $6,$7,$8} cat /var/log/messages |awk /syslog/ {print 6,7,8} cat /var/log/messages |awk /syslog/ {print $6,$7,$8} cat /var/log/messages |awk syslog {print 6,7,8}
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16 Which of the following elements must be included at the beginning of every shell script A B C D #Comment #!/bin/bash exit 0 #begin script
17 You ve created a shell script in your home directory named myscript How can you execute it (Choose two) A B C D E A B C D Enter /bin/bash ~/myscript at the shell prompt Enter myscript at the shell prompt Select Start > Run at the shell prompt, then enter ~/myscript and select Run Enter run ~/myscript at the shell prompt Enter chmod u+x ~/myscript, then enter myscript at the shell prompt variable i TOTAL declare i TOTAL declare TOTAL t integer TOTAL=integer
18 Which command will create a new variable named TOTAL and set its type to be integer
LAB QUESTION
You need to create a script that can be used by the root user to mount removable media The script should display a prompt on the screen asking the user if he or she wants to mount a CD or a floppy After mounting the appropriate device, the corresponding entry from the mount command should be displayed on the screen along with a listing of files on the device Your script should also account for user error Outline the process you will follow to create and implement this script
9: Using the Linux Shell
SELF TEST ANSWERS
Use the Bourne Again Shell
1 D The bash shell is the default shell on most Linux distributions A, B, and C are incorrect While these shells are available on most distributions, the Bourne Again SHell (bash) is usually the default shell used 2 A A non-login shell reads the ~/bashrc file to define the user s shell environment B, C, and D are incorrect B is used by login bash shells to set the user environment C is also used by login bash shells to set the user environment D is incorrect for the same reason 3 E The /etc/profile file is read when a bash login shell is first opened A, B, C, and D are incorrect A is read by non-login shells (although it may be read by login shells as well through one of the other configuration files) B is read, if it exists, but only after /etc/profile has been read The same is true of C and D 4 B The ~/bash_history file contains a list of your most recent shell commands A, C, and D are incorrect A, C, and D are distracters There are no such files 5 C The key is used with command completion A, B, and D are incorrect A is used to enter a command in the shell It can t be used with command completion B is a distracter D is incorrect It is used with command history, not command completion
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