Deck 4: Unix-Linux File Processing

Question 1

System administrators and programmers refer to standard output as ____.

A)sout
B)stout
C)stdout
D)standardout

Answer 1

C

Question 2

To redirect the list of the files in a directory to a file called homedir.list,you enter ____.

A)ls < homedir.list
B)ls > homedir.list
C)homedir.list < ls
D)homedir.list > ls

Answer 2

B

Question 3

You can use the ____ command to create empty files.

A)touch
B)create
C)make
D)null

Answer 3

A

Question 4

In UNIX-Linux,text files and binary files are considered to be ____ files.

A)executable
B)document
C)regular
D)dynamic

Question 5

The ____ option of the find command displays files that have been changed within the last n minutes.

A)-min n
B)-cmin n
C)-nmin n
D)-mmin n

Question 6

UNIX-Linux store data,such as letters,product records,or vendor reports,in flat ASCII files.

Question 7

Moving and renaming a file are essentially the same operation.

Question 8

When you no longer need a file,you can delete it using the ____ command.

A)rm
B)remove
C)dl
D)delete

Question 9

System administrators and programmers refer to standard input as ____.

A)sin
B)stin
C)stdin
D)standardin

Question 10

The cp ____ option creates a symbolic link or name at the destination rather than a physical file.

A)-s
B)-y
C)-l
D)-n

Question 11

When you no longer need a directory,you can use command ____ to remove it.

A)xtree
B)rmdir
C)dldir
D)deltree

Question 12

You can complete a project using awk that you cannot complete using a combination of paste,cut,sort,and join.

Question 13

When you are moving files,using the -o option with the mv command can be a good idea so that you don't unexpectedly overwrite a destination file with the same name.

Question 14

When you use the paste command,by default,the pasted results appear in columns separated by commas.

Question 15

To move a file,you use the ____ command along with the source file name and destination name.

A)rm
B)rename
C)mv
D)move

Question 16

The command > accountsfile ____.

A)deletes de file accountsfile
B)is not valid in UNIX/Linux systems
C)displays the contents of the file accountsfile on the screen
D)creates an empty file called accountsfile

Question 17

The command rmdir can be used to delete a directory that is not empty.

Question 18

You can use the ____ operator to redirect commands or program error messages from the screen to a file.

A)1>
B)2>
C)3>
D)4>

Question 19

Character special files are used by input-output devices for communicating one character at a time,providing what is called ____ data.

A)raw
B)binary
C)ASCII
D)block

Question 20

When you use cat to combine two files into a third file,the first line of the output contains the first line of the first file followed by the first line of the second file.

Question 21

The ____ option of the find command displays files that have been changed within the last n days.

A)-cdays n
B)-ctime n
C)-mdays n
D)-mtime n

Question 22

The ____________________ option of the paste command causes files to be pasted one after the other instead of in parallel.

Question 23

Match each item with a statement below.
a.-name
f.-i
b.-r
g.-u
c.-c
h.paste
d.>
i.-t
e.-d
when deleting a directory with rm,this option is used to recursively delete its files and subdirectories

Question 24

You can use the ____________________ command to associate lines in two files on the basis of a common field in both files.

Question 25

Match each item with a statement below.
a.-name
f.-i
b.-r
g.-u
c.-c
h.paste
d.>
i.-t
e.-d
option of the mv command that overwrites a destination file with the same name,if the source file is newer than the one in the destination

Question 26

Match each item with a statement below.
a.-name
f.-i
b.-r
g.-u
c.-c
h.paste
d.>
i.-t
e.-d
option of the cp command that provides a warning before an existing file with the same name is overwritten

Question 27

____________________ special files are related to devices,such as disks,and send information using blocks of data.

Question 28

To run the myscript shell script located in the current directory,you should enter: ____.

A)start myscript
B)/.myscript
C)run myscript
D)./myscript

Question 29

The join command is used to associate information in two different files on the basis of a common field or ____ in those files.

A)index
B)link
C)column
D)key

Question 30

Although the touch command cannot alter a file's ____________________ changed date and time,it can alter the file's access and modification dates and times.

Question 31

You can use the ____________________ command to sort a file's contents alphabetically or numerically.

Question 32

When you use find,it is useful to note that some UNIX versions require the ____ option after the file name to display the names of files.

A)-display
B)-print
C)-show
D)-names

Question 33

When UNIX-Linux detect errors in processing system tasks and user programs,they direct the errors to ____________________,which,by default,is the screen.

Question 34

A sorting ____ is a field position within each line.

A)index
B)key
C)column
D)position

Question 35

If you execute ____,the contents of file1 are sorted and the results are stored in file2.

A)sort file1 -o file2
B)sort file1 -d file2
C)sort file1 > file2
D)sort file1 file2

Question 36

The ____ command is used to look for patterns in files.

A)awk
B)find
C)pattern
D)search

Question 37

Match each item with a statement below.
a.-name
f.-i
b.-r
g.-u
c.-c
h.paste
d.>
i.-t
e.-d
this option prevents the touch command from creating a file,if it does not already exist

Question 38

The paste command normally sends its output to ____.

A)stdout
B)null
C)stderr
D)the file indicated as an argument

Question 39

The ____ option of the paste command is used to specify a different separator as a delimiter.

A)-t
B)-o
C)-d
D)-s

Question 40

You can use the ____________________ command to remove specific columns or fields from a file.

Question 41

Match each item with a statement below.
a.-name
f.-i
b.-r
g.-u
c.-c
h.paste
d.>
i.-t
e.-d
option of the sort command used to indicate that a specific character separates the fields

Question 42

Match each item with a statement below.
a.-name
f.-i
b.-r
g.-u
c.-c
h.paste
d.>
i.-t
e.-d
can be used with cat to combine the contents of two files

Question 43

Describe some tasks that the awk command can perform.

Question 44

What is a shell script?

Question 45

What is the find command used for?

Question 46

What is Awk?

Question 47

Assuming project1,project2 and project3 are files,what is the purpose of entering the following command?
cp project1 project2 project3 duplicates

Question 48

Match each item with a statement below.
a.-name
f.-i
b.-r
g.-u
c.-c
h.paste
d.>
i.-t
e.-d
is an option of the find command

Question 49

What is the purpose of entering the following command?
cat janes_research marks_research > total_research

Question 50

What is the purpose of entering the following command?
cp designs-* duplicates

Question 51

Consider a simple file,called vegetables,containing the following four lines:
Carrots
Spinach
Lettuce
Beans
We also have a bread file that contains the following four lines:
Whole wheat
White bread
Sourdough
Pumpernickel
What will be the result of executing the following command?
paste -d',' vegetables bread > food

Question 52

Match each item with a statement below.
a.-name
f.-i
b.-r
g.-u
c.-c
h.paste
d.>
i.-t
e.-d
combines files side by side

Question 53

Match each item with a statement below.
a.-name
f.-i
b.-r
g.-u
c.-c
h.paste
d.>
i.-t
e.-d
option of the cut command used to indicate that a specific character separates the fields

Question 54

What is a variable-length record?

Question 55

What is a fixed-length record?