Frequent question: How do you find the nth line of a file in Unix?

How do I get the 10th line from a text file in Unix?

How do you display the 10th line of a file in Unix?

  1. head -10 bar. txt.
  2. head -20 bar. txt.
  3. sed -n 1,10p /etc/group.
  4. sed -n 1,20p /etc/group.
  5. awk ‘FNR
  6. awk ‘FNR
  7. perl -ne’1.. 10 and print’ /etc/passwd.
  8. perl -ne’1.. 20 and print’ /etc/passwd.

How do you find the 10th line in a text file?

Where NUM is the number of the line you want to print; so, for example, sed ’10q;d’ file to print the 10th line of file .

How do you find a specific line in a file Linux?

Using the head and tail commands, we can easily get the first and last parts of a file.

  1. First, we get line 1 to X using the head command: head -n X input.
  2. Then, we pipe the result from the first step to the tail command to get the last line: head -n X input | tail -1.
IT IS IMPORTANT:  What are the 10 functions of operating system?

How do I extract a specific line from a text file in Unix?

To extract a range of lines, say lines 2 to 4, you can execute either of the following:

  1. $ sed -n 2,4p somefile. txt.
  2. $ sed ‘2,4! d’ somefile. txt.

How can you display nth line of a file?

Below are three great ways to get the nth line of a file in Linux.

  1. head / tail. Simply using the combination of the head and tail commands is probably the easiest approach. …
  2. sed. There are a couple of nice ways to do this with sed . …
  3. awk. awk has a built in variable NR that keeps track of file/stream row numbers.

What command will print nth line?

N,$ with “p” command prints from Nth line to end of file.

How do I extract the second row of a text file?

Ataul

  1. Ataul. Answered On : May 20th, 2015.
  2. Code. head -2 filename | tail -1. Similarly to get the 2nd last line, the order will be reversed that is. tail -2 filename | head -1.

Which command is used to count line in the file?

Use the wc command to count the number of lines, words, and bytes in the files specified by the File parameter.

How do I show the middle line in Linux?

The command “head” is used to view the top lines of a file and command “tail” is used to view lines at the end.

How do I view a line in Linux?

How to show lines in vi or vim text editor

  1. Press the ESC key.
  2. Type : (the colon)
  3. Execute the following command to show lines in vi/vim: set number.
  4. Now you can see line numbers on the left side of the vi/vim text editor screen.
IT IS IMPORTANT:  You asked: What does recursive mean in Unix?

How do you show lines in Linux?

To do so:

  1. Press the Esc key if you are currently in insert or append mode.
  2. Press : (the colon). The cursor should reappear at the lower left corner of the screen next to a : prompt.
  3. Enter the following command: set number.
  4. A column of sequential line numbers will then appear at the left side of the screen.

How read a file line by line in Linux?

How to Read a File Line By Line in Bash. The input file ( $input ) is the name of the file you need use by the read command. The read command reads the file line by line, assigning each line to the $line bash shell variable. Once all lines are read from the file the bash while loop will stop.

How do you extract a line from a text file in Python?

To read a text file in Python, you follow these steps: First, open a text file for reading by using the open() function. Second, read text from the text file using the file read() , readline() , or readlines() method of the file object.

1) open() function.

Mode Description
‘a’ Open a text file for appending text

How do I extract a specific line from a file in Python?

How to read specific lines of a text file in Python

  1. a_file = open(“test_file.txt”)
  2. lines_to_read = [0, 2]
  3. for position, line in enumerate(a_file): Iterate over each line and its index.
  4. if position in lines_to_read:
  5. print(line)