7874491
Descripción
Test por Victor Rodriguez, actualizado hace más de 1 año
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Creado por Victor Rodriguez
hace casi 8 años
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Pregunta 1
Pregunta
Which environment variable stores the format for the command prompt?
Respuesta
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A. PROMPT
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B. PSI
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C. PAGER
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D. PS1
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E. None of these variables store the format for the command prompt.
Pregunta 2
Pregunta
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?
Respuesta
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A. alias cdpt='cd ~/papers/trade'
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B. export cdpt='cd ~/papers/trade'
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C. alias cdpt 'cd ~/papers/trade'
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D. alias cd 'cdpt ~/papers/trade'
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E. env cdpt `cd ~/papers/trade`
Pregunta 3
Pregunta
What is the purpose of the EDITOR environment variable?
Respuesta
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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.
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B. It specifies the filename of the text editor that bash uses by default while you’re entering commands at its prompt.
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C. If you type edit filename at a command prompt, the program specified by EDITOR will be launched.
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D. If it’s set to GUI, programs call a GUI editor; if it’s set to TEXT, programs call a textbased editor.
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E. Some programs refer to EDITOR to determine what external editor to launch when they need to launch one.
Pregunta 4
Pregunta
In what environment variable is the current working directory stored?
Respuesta
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A. PATH
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B. CWD
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C. PWD
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D. PRESENT
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E. WORKING
Pregunta 5
Pregunta
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.)
Respuesta
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A. export MYVAR='mystuff'
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B. MYVAR='mystuff'
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C. MYVAR='mystuff'; export MYVAR
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D. echo $MYVAR mystuff
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E. setenv MYVAR mystuff
Pregunta 6
Pregunta
What file might a user modify to alter their own bash environment?
Respuesta
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A. /etc/inputrc
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B. /etc/bashrc
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C. $HOME/bashrc
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D. $HOME/.profile_bash
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E. ~/.bashrc
Pregunta 7
Pregunta
What commands might you use (along with appropriate options) to learn the value of a
specific environment variable? (Select two.)
Respuesta
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A. env
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B. DISPLAY
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C. export
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D. echo
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E. cat
Pregunta 8
Pregunta
Immediately after creating a shell script called a_script.sh in a text editor, which method
will not work to run the script?
Respuesta
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A. Typing bash a_script.sh at the command line.
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B. Typing ./a_script.sh at the command line.
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C. Typing . a_script.sh at the command line.
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D. Typing source a_script.sh at the command line.
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E. Any of the above will work.
Pregunta 9
Pregunta
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
Respuesta
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A. It has the same effect as the cp command—copying the contents of big.c to big.cc.
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B. It compiles the C program big.c and calls the result big.cc.
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C. It copies the contents of big.cc to big.c, eliminating the old big.c.
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D. It converts the C program big.c into a C++ program called big.cc.
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E. It interprets the big.c and big.cc files as bash scripts.
Pregunta 10
Pregunta
Where are the commands iterated by the loop located within the loop?
Respuesta
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A. Within the then statement section
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B. Between the double semicolons (;;)
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C. Within the case and esac constructs
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D. Within the test statement
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E. Between do and done constructs
Pregunta 11
Pregunta
Which of the following lines identify valid shell scripts on a normally configured system?
(Select two.)
Respuesta
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A. #!/bin/script
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B. #!/bin/bash
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C. #!/bin/tcsh
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D. !#/bin/sh
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E. !#/bin/zsh
Pregunta 12
Pregunta
Which of the following are valid looping statements in bash shell scripting? (Select all that apply.)
Respuesta
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A. for
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B. while
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C. if-then
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D. until
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E. case
Pregunta 13
Pregunta
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?
Respuesta
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A. postmaster
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B. john
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C. The account listed in ~/.forward
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D. root
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E. No user, because an alias was set
Pregunta 14
Pregunta
Which of the following is not a popular SMTP server for Linux?
Respuesta
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A. Postfix
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B. Sendmail
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C. Fetchmail
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D. Exim
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E. qmail
Pregunta 15
Pregunta
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?
Respuesta
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A. An email is sent to the user Error, the script is aborted using root privileges, and error messages are written to /tmp/msg.
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B. An email with the subject of Error and the contents from /tmp/msg is sent to the local users root and abort.
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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.
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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.
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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.
Pregunta 16
Pregunta
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?
Respuesta
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A. service sendmail status
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B. lp -d queue ~/Maildir
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C. sendmail -bq
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D. mailq
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E. ls /var/spool
Pregunta 17
Pregunta
You examine your /etc/aliases file and find that it contains the following line:
root: jody
What can you conclude from this?
Respuesta
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A. Email addressed to jody on this system will be sent to the local user root.
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B. Email addressed to root on this system will be sent to the local user jody.
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C. The local user jody has broken into the system and has acquired root privileges.
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D. The local user jody has permission to read email directly from root’s mail queue.
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E. The administrator may log in using either username: root or jody.
Pregunta 18
Pregunta
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?
Respuesta
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A. Type NEW DATABASE fish; at the mysql> prompt.
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B. Type CREATE DATABASE fish; at the mysql> prompt.
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C. Type NEW DATABASE FISH; at the mysql> prompt.
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D. Type DATABASE CREATE fish; at the mysql> prompt.
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E. Type DB CREATE fish; at the mysql> prompt.
Pregunta 19
Pregunta
Which of the following are true statements about SQL tables? (Select two.)
Respuesta
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A. Multiple tables may exist in a single SQL database.
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B. Tables may be combined for cross-table searches using the DROP command.
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C. Tables consist of rows, each of which holds attributes, and columns, each of which defines a specific database item.
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D. Careful table design can reduce the amount of data entry and database storage size.
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E. Tables are stored on disk using a lossy compression algorithm.
Pregunta 20
Pregunta
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';
Respuesta
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A. It returns database entries from the stars table for all stars with magnitude of 2.25 and starname of Mintaka.
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B. It sets the value of the stars field in the magnitude set to Mintaka, using a precision of 2.25.
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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.
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D. It combines the stars and magnitude=2.25 tables, returning all items for which the starname is Mintaka.
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E. It updates the stars database, creating a new entry with a starname value of Mintaka and a magnitude of 2.25.
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