Victor Rodriguez
Quiz by , created more than 1 year ago

105.1 Customize and use the shell environment 105.2 Customize or write simple scripts 105.3 SQL data management 108.3 Mail Transfer Agent (MTA) basics

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Victor Rodriguez
Created by Victor Rodriguez almost 8 years ago
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Libro T9 - Writing Scripts, Configuring Email, and Using Databases

Question 1 of 20

1

Which environment variable stores the format for the command prompt?

Select one of the following:

  • A. PROMPT

  • B. PSI

  • C. PAGER

  • D. PS1

  • E. None of these variables store the format for the command prompt.

Explanation

Question 2 of 20

1

You want to create a shortcut command for the command cd ~/papers/trade. Which of
the following lines, if entered in a bash startup script, will accomplish this goal?

Select one of the following:

  • A. alias cdpt='cd ~/papers/trade'

  • B. export cdpt='cd ~/papers/trade'

  • C. alias cdpt 'cd ~/papers/trade'

  • D. alias cd 'cdpt ~/papers/trade'

  • E. env cdpt `cd ~/papers/trade`

Explanation

Question 3 of 20

1

What is the purpose of the EDITOR environment variable?

Select one of the following:

  • A. If it’s set to Y (the default), the shell environment permits editing of commands; if it’s
    set to N, such editing is disallowed.

  • B. It specifies the filename of the text editor that bash uses by default while you’re entering commands at its prompt.

  • C. If you type edit filename at a command prompt, the program specified by EDITOR
    will be launched.

  • D. If it’s set to GUI, programs call a GUI editor; if it’s set to TEXT, programs call a textbased editor.

  • E. Some programs refer to EDITOR to determine what external editor to launch when they
    need to launch one.

Explanation

Question 4 of 20

1

In what environment variable is the current working directory stored?

Select one of the following:

  • A. PATH

  • B. CWD

  • C. PWD

  • D. PRESENT

  • E. WORKING

Explanation

Question 5 of 20

1

If typed in a bash shell, which of the following commands will create an environment variable called MYVAR with the contents mystuff that will be accessible to any created subshells?
(Choose all that apply.)

Select one or more of the following:

  • A. export MYVAR='mystuff'

  • B. MYVAR='mystuff'

  • C. MYVAR='mystuff'; export MYVAR

  • D. echo $MYVAR mystuff

  • E. setenv MYVAR mystuff

Explanation

Question 6 of 20

1

What file might a user modify to alter their own bash environment?

Select one of the following:

  • A. /etc/inputrc

  • B. /etc/bashrc

  • C. $HOME/bashrc

  • D. $HOME/.profile_bash

  • E. ~/.bashrc

Explanation

Question 7 of 20

1

What commands might you use (along with appropriate options) to learn the value of a
specific environment variable? (Select two.)

Select one or more of the following:

  • A. env

  • B. DISPLAY

  • C. export

  • D. echo

  • E. cat

Explanation

Question 8 of 20

1

Immediately after creating a shell script called a_script.sh in a text editor, which method
will not work to run the script?

Select one of the following:

  • A. Typing bash a_script.sh at the command line.

  • B. Typing ./a_script.sh at the command line.

  • C. Typing . a_script.sh at the command line.

  • D. Typing source a_script.sh at the command line.

  • E. Any of the above will work.

Explanation

Question 9 of 20

1

Describe the effect of the following short script, cp1.sh, if it’s called as cp1.sh big.c
big.cc:
#!/bin/bash
cp $2 $1

Select one of the following:

  • A. It has the same effect as the cp command—copying the contents of big.c to big.cc.

  • B. It compiles the C program big.c and calls the result big.cc.

  • C. It copies the contents of big.cc to big.c, eliminating the old big.c.

  • D. It converts the C program big.c into a C++ program called big.cc.

  • E. It interprets the big.c and big.cc files as bash scripts.

Explanation

Question 10 of 20

1

Where are the commands iterated by the loop located within the loop?

Select one of the following:

  • A. Within the then statement section

  • B. Between the double semicolons (;;)

  • C. Within the case and esac constructs

  • D. Within the test statement

  • E. Between do and done constructs

Explanation

Question 11 of 20

1

Which of the following lines identify valid shell scripts on a normally configured system?
(Select two.)

Select one or more of the following:

  • A. #!/bin/script

  • B. #!/bin/bash

  • C. #!/bin/tcsh

  • D. !#/bin/sh

  • E. !#/bin/zsh

Explanation

Question 12 of 20

1

Which of the following are valid looping statements in bash shell scripting? (Select all that apply.)

Select one or more of the following:

  • A. for

  • B. while

  • C. if-then

  • D. until

  • E. case

Explanation

Question 13 of 20

1

Your SMTP email server receives a message addressed to postmaster. The postmaster
username has an alias of john on this computer. Assuming that the system is properly configured, who will receive the email message?

Select one of the following:

  • A. postmaster

  • B. john

  • C. The account listed in ~/.forward

  • D. root

  • E. No user, because an alias was set

Explanation

Question 14 of 20

1

Which of the following is not a popular SMTP server for Linux?

Select one of the following:

  • A. Postfix

  • B. Sendmail

  • C. Fetchmail

  • D. Exim

  • E. qmail

Explanation

Question 15 of 20

1

You see the following line in a script:
mail -s "Error" -c abort < /tmp/msg root
What is the effect of this line, if and when it executes?

Select one of the following:

  • A. An email is sent to the user Error, the script is aborted using root privileges, and error
    messages are written to /tmp/msg.

  • B. An email with the subject of Error and the contents from /tmp/msg is sent to the local
    users root and abort.

  • C. An email with the subject of Error and the contents of /tmp/msg is sent to the local
    user root, and then the script is aborted.

  • D. An email is sent with Error priority to the local user root, and the email system is
    then shut down with error messages being stored in /tmp/msg.

  • E. An email with the subject of Error and contents of /tmp/msg is sent to root, and
    information on this is logged with priority abort.

Explanation

Question 16 of 20

1

Your Internet connection has gone down for several hours. What command can you use to
check if there is a long list of jobs in the email queue?

Select one of the following:

  • A. service sendmail status

  • B. lp -d queue ~/Maildir

  • C. sendmail -bq

  • D. mailq

  • E. ls /var/spool

Explanation

Question 17 of 20

1

You examine your /etc/aliases file and find that it contains the following line:
root: jody
What can you conclude from this?

Select one of the following:

  • A. Email addressed to jody on this system will be sent to the local user root.

  • B. Email addressed to root on this system will be sent to the local user jody.

  • C. The local user jody has broken into the system and has acquired root privileges.

  • D. The local user jody has permission to read email directly from root’s mail queue.

  • E. The administrator may log in using either username: root or jody.

Explanation

Question 18 of 20

1

You’ve just installed MySQL and run it by typing mysql. How would you create a database
called fish to store data on different varieties of fish?

Select one of the following:

  • A. Type NEW DATABASE fish; at the mysql> prompt.

  • B. Type CREATE DATABASE fish; at the mysql> prompt.

  • C. Type NEW DATABASE FISH; at the mysql> prompt.

  • D. Type DATABASE CREATE fish; at the mysql> prompt.

  • E. Type DB CREATE fish; at the mysql> prompt.

Explanation

Question 19 of 20

1

Which of the following are true statements about SQL tables? (Select two.)

Select one or more of the following:

  • A. Multiple tables may exist in a single SQL database.

  • B. Tables may be combined for cross-table searches using the DROP command.

  • C. Tables consist of rows, each of which holds attributes, and columns, each of which
    defines a specific database item.

  • D. Careful table design can reduce the amount of data entry and database storage size.

  • E. Tables are stored on disk using a lossy compression algorithm.

Explanation

Question 20 of 20

1

What is the effect of the following SQL command, assuming the various names and
data exist?
mysql> UPDATE stars SET magnitude=2.25 WHERE starname='Mintaka';

Select one of the following:

  • A. It returns database entries from the stars table for all stars with magnitude of 2.25
    and starname of Mintaka.

  • B. It sets the value of the stars field in the magnitude set to Mintaka, using a precision
    of 2.25.

  • C. It sets the value of the magnitude field to 2.25 for any item in the stars table with the
    starname value of Mintaka.

  • D. It combines the stars and magnitude=2.25 tables, returning all items for which the
    starname is Mintaka.

  • E. It updates the stars database, creating a new entry with a starname value of Mintaka
    and a magnitude of 2.25.

Explanation

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