UNIX Basics 2

Question 1

What does the date command do?

Answer 1

Displays the current date and time

Question 2

What does the cal command do?

Answer 2

The calendar command displays the current month.

Question 3

What does the du command do?

Answer 3

Prints the number of disk blocks -512 byte units, being used by the contents of the current directory.

Question 4

What does the sort command do?

Answer 4

Sorts the input according to the given option.

Question 5

What does the cut command do?

Answer 5

Extracts columns out of text files.

Question 6

What does the tar command do?

Answer 6

Bundles files into an archive.

Question 7

What does the diff command do?

Answer 7

Finds the differences between 2 files.

Question 8

What does the grep command do?

Answer 8

Search for information using regular expressions.

Question 9

What does the&raquo_space; vs the > do?

Answer 9

> prints the output into a file, while&raquo_space; appends the output into a file.

Question 10

What is a pipe?

Answer 10

This will bring unix commands together.

Question 11

What does date +%Y-%m-%d print?

Answer 11

2024-11-23

Question 12

What does date +%j print?

Answer 12

The number of days since January 1st.

Question 13

What does date +%s print?

Answer 13

The Unix timestamp.

Question 14

What does cal -n numberOfMonths print?

Answer 14

The first month plus however many months.

Question 15

What does cal -w print?

Answer 15

Displays the week number.

Question 16

What does cal -j print.

Answer 16

Displaying the day numbers.

Question 17

What does du COP3363 print?

Answer 17

Prints the disk usage of the entered directory.

Question 18

What does du -h print?

Answer 18

Prints the disk usage in human readable form.

Question 19

What does du -s print?

Answer 19

Prints a grand summary of the disk space used.

Question 20

What does du -a do?

Answer 20

Prints the disk usage of all files and subdirectories in the current directory.

Question 21

What does du -c print?

Answer 21

Prints a grand total for each file.

Question 22

What was head -n __ print?

Answer 22

Prints the first blank number of lines instead of the first ten.

Question 23

What does head -c __ print?

Answer 23

Prints the first blank number of bytes.

Question 24

Does tail share the same options meanings?

Answer 24

Yes!

Question 25

What does tail -h print?

Answer 25

Watches for changes in the file (for logging).

Question 26

What does the cut -c print?

Answer 26

Cuts each line of the file from start position to end position.

Question 27

What does cut -b print?

Answer 27

Cuts by bytes instead of characters.

Question 28

What does cut -f fieldNumbers -d delimiters print?

Answer 28

Separates the lines into fields based off the delimiters then prints the significant fields.

Question 29

What does cut [options] –complement filename print?

Answer 29

Prints the complement - the parts of the files that would have been left out in the original cut command.

Question 30

What does cut [options] –output-delimiter new dl filename print?

Answer 30

Changes the output delimiter from space to the given delimiter

Question 31

What does sort -r fileName print?

Answer 31

Sorts in reverse order.

Question 32

What does sort -n fileName print?

Answer 32

Sorts numerical content as numbers instead of lexicographical order.

Question 33

What does Dort -f fileName print?

Answer 33

Ignores the case while sorting.

Question 34

What does sore -c fileName print?

Answer 34

Checks if a file is already sorted. Prints the lines that are not in order. The file is already sorted if there is no output.

Question 35

What does sort -u fileName print?

Answer 35

Sorts the file contents and removes the duplicates.

Question 36

What does tar -c print?

Answer 36

insert files into a tar file?

Question 37

What does tar -f print?

Answer 37

Uses the name of the tar file that is specified.

Question 38

What does tar -v print?

Answer 38

Outputs the name of each file as it is inserted into or extracted from a tar file.

Question 39

What does tar -x print?

Answer 39

Extracts the files from a tar file.

Question 40

What does tar -t print?

Answer 40

Lists contents of an archive.

Question 41

What does tar -z print?

Answer 41

gzip/gunzip if necessary.

Question 42

What does the diff -b print?

Answer 42

Treat groups of spaces as one.

Question 43

What does diff -i print?

Answer 43

ignores case

Question 44

What does tar -r print?

Answer 44

Includes directories in comparison.

Question 45

What does diff -w do?

Answer 45

Ignores all spaces and tabs.

Question 46

What does grep -i do?

Answer 46

Ignores case.

Question 47

what does grep -n print?

Answer 47

Displays line numbers.

Question 48

What does grep -l print?

Answer 48

Displays only the names of the files and note the actual lines.

Question 49

What does grep -P do?

Answer 49

Pattern is a Perl regular expression, not a Unix regular expression.