CH10 : Working with file content

Question 1

head

Answer 1

You can use head to display the first ten lines of a file.

Question 2

head -4 /etc/passwd

displays

Answer 2

dislplays the first n line of a component

Question 3

head can also display the first n bytes.

Answer 3

root:x:0:0:roopaul@debian7~$

Question 4

tail

Answer 4

display the last ten lines of a file.

u can give tail the number of lines you want to see.

Question 5

cat

Answer 5

The cat command is one of the most universal tools

yet all it does is copy standard input to standard output

you can use cat to display a file on the screen
If the file is longer than the screen, it will scroll to the end.

Question 6

cat is short for

Answer 6

concatenate.

Question 7

Cat - create files

Answer 7

You can use cat to create flat text files.

$ cat > winter.txt

Question 8

here directive

Answer 8

You can choose an end marker for cat with &laquo_space;as is shown in this screenshot. This construction is called a here directive and will end the cat command.

Question 9

Cat - copy files

Answer 9

cat file1 > file2
coping the content of file1 to file2

viewing file2 conent
$cat file2

Question 10

tac

Answer 10

reverse the file content

Question 11

more and less

Answer 11

he more command is useful for displaying files that take up more than one screen.

More will allow you to see the contents of the file page by page. Use the space bar to see the next page, or q to quit.
Some people prefer the less command to more.

Question 12

strings

Answer 12

With the strings command you can display readable ascii strings found in (binary) files.