How does linux view certain lines of a file
This article mainly explains the "linux how to view some lines of the file", the article explains the content is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "linux how to view a few lines of the file" bar!
Linux to view a few lines of the file method: 1, use the sed command, syntax "sed-n'X Yp' file name", you can view the contents of the file line X to Y; 2, with cat, tail and head commands, syntax "cat file name | tail-n + X | head-n Y".
The operating environment of this tutorial: linux5.9.8 system, Dell G3 computer.
The method of viewing certain lines of a file by 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 file lines 31 to 45
Sed-n'31 450p 'requirements.txt
Method 2: use the 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 with the specified parameters
The head command displays the beginning of the file to the standard output
Combine the three commands to view lines x to Y of the file.
Syntax format 1: start at line X and display line Y. That is, the line X~ (Ymur1) is displayed.
Cat filename | tail-n + X | head-n Y
Example: start at line 3000 and display 1000 lines; that is, display 3000mm 3999 lines
Cat requirements.txt | tail-n + 3000 | head-n 1000
Syntax format 2: display lines X to Y
Cat filename | head-n X | tail-n + Y
Example: display lines 1000 to 3000
Cat requirements.txt | head-n 3000 | tail-n + 1000
* Note the order of the two methods
Decompose:
Tail-n 1000: displays the last 1000 lines
Tail-n + 1000: displays from line 1000 and after line 1000
Head-n 1000: displays the first 1000 lines
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