How linux deletes the last few lines

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Linux delete the last few lines: 1, use the "sed $(($Amuri 3: 1)), ${A} d a.txt" command to delete the last few lines of the file; 2, use the "sed '2d`-I aa.txt" command to delete all lines from line 2 to the end of the file.

This article operating environment: linux5.9.8 system, Dell G3 computer.

How does linux delete the next few lines?

Linux deletes the last few lines of the file:

1.

[root@server ~] # cat aa.txtaaaabbbbccccddddeeee [root@server ~] # sed $(sed-n'$= 'a.txt) [root@server ~] # sed $(($Amuri 3: 1)), ${A} d a.txt [root@server ~] # cat aa.txtaaaa

Or use the above two commands. The last three lines are deleted.

If you delete the countdown 300, just change 3 to 300.

two。

-I is to be modified on the original file. If you don't need to modify it, you don't need I.

Among them, sed'2 was named "I aa.txt".

This command deletes all lines from line 2 (including line 2) to the end of the file.

Note:

Command one operates the original file, resulting in newly generated files everywhere or printed to the screen

The second command is to directly manipulate the original file, as a result, the original file has been changed, resulting in the command result.

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