How to view certain lines of a file in Linux

How to view certain lines of a file in Linux: 1. Use the sed command with the syntax "sed -n 'X,Yp' file name" to view the contents of lines X to Y of the file; 2. Use the cat, tail and head commands with the syntax "cat file name | tail -n X | head -n Y".

#The operating environment of this tutorial: linux5.9.8 system, Dell G3 computer.

How to view certain lines of a file in Linux

##Method 1: Use the sed command

sed -n 'X,Yp' filename

You can view lines x to Y of the file.

For example: display lines 31 to 45 of the file

sed -n '31,45p' requirements.txt

##Method 2: Use cat, tail and head commands

The cat command can be used to display the contents of a text file
The tail command outputs the last part of the file to a standard device according to the specified parameters
The head command displays the beginning of the file to the standard output
Combine the three commands to view the x-th to Y-th lines of the file.

Syntax format 1: Starting from line X, display line Y. That is, display the Y row

cat filename | tail -n +X | head -n Y

Example: Display rows 1000 to 3000

cat requirements.txt | tail -n +3000 | head -n 1000

*Note the order of the two methods

Decomposition:

tail -n 1000

: Display the last 1000 lines

• ##tail -n 1000: Display starting from line 1000 and display the following lines

• head -n 1000: Display the first 1000 lines

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