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NOS 120 FINAL EXAM QUESTIONS AND ANSWERS
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NOS 120 FINAL EXAM QUESTIONS ANDANSWERS
Require that scriptwriters place comment lines inside the scripts using
the # symbol to begin each comment line. - ANSWER Your organization
routinely uses scripts, but as some employees have left, some scripts
contain only command lines and no one is certain of their purpose.What
steps can be taken to ensure a way for others to know the purpose of a
script?
Bash
csh
zsh - ANSWER Which of the following shells enables the use of scripts?
(Choose all that apply.)
alias l=" ls -a" - ANSWER You frequently use the command ls -a and
want to save time by just entering l to do the same thing.Which of the
following commands enables you to set your system to view hidden files
by only entering l ?
sh -v
sh -x - ANSWER You have written a script, but when you run it there is
an error. Which of the following commands can you use to debug your
script? (Choose all that apply.)
trap - ANSWER You have written a shell program that creates four
temporary files.Which of the following commands can you use to remove
these files when the script has completed its work?
case - ANSWER Which of the following commands works well for menus
used in a script? (Choose all that apply.)
echo $PATH - ANSWER You are currently in the source directory, which
is the new directory you have just created for storing and running your
scripts.You want to make certain that the source directory is in your
default path.Which of the following commands enables you to view the
current default path settings?
,You did not give all users in your department execute permission for that
script. - ANSWER You have created a script for use by your entire
department in a commonly accessed directory. Only you are able to run
the script, which works perfectly.Which of the following is likely to be the
problem?
more account[ a,b,c,d,e ] - ANSWER Your current working directory
contains a series of files that start with the word "account" combined with
a, b, c, d, and e, such as accounta, accountb, and so on. Which of the
following commands enables you to view the contents of all of these
files? (Choose all that apply.)
if - ANSWER For which of the following logic structures used within a
script is fi the final line for that logic structure? (Choose all that apply.)
!
<
%
* - ANSWER Which of the following are examples of arithmetic or
relational operators? (Choose all that apply).
You need to use the export command so these variables have global
use. - ANSWER You have created a series of scripts that use the same
environment variables. However, when you run these scripts, some of
them do not seem to recognize the environment variables you have set.
What is the problem?
Enter the command, set -o noclobber before you start. - ANSWER You
have spent the last two hours creating a report in a file and afterwards
you use cat to create a new file. Unfortunately the new file name you
used was the same as the name you used for the report, and now your
report is gone.What should you do next time to prevent this from
happening?
OSTYPE - ANSWER You have remotely logged into a computer running
UNIX or Linux, but you are not certain about which operating system you
, are using. However, when you display the contents of the variable it
shows which operating system you are using.
printenv - ANSWER What command can you use to view the
environment and configuration variables already configured on your
system?
let x=5*9
let x=y+10
let m=12/4
let r=128-80 - ANSWER Which of the following are valid expressions?
(Choose all that apply.)
do - ANSWER When you type for wood maple spruce oak pine at the
command line and then press Enter, what should you type next at the >
prompt?
myfiles='ls -l' - ANSWER You want to store a long listing of your files in a
variable called myfiles.Which of the following commands enables you to
do this?
There should be a dollar sign in front of selection, as in "$selection" -
ANSWER What error is in the following script code?
case "selection" in
" i ") ./listscript ;;
" ii ") ./numberscript ;;
" iii ") ./findscript ;;
esac
sh -n value - ANSWER You are working with a colleague on a script
called value that updates several files.You want to test the script, but not
update the files. Which of the following commands can you use?
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