How to delete the last few lines in linux

How to delete the last few lines in Linux: 1. Use the "sed $(($ A-3 1)),${A}d a.txt" command to delete the last few lines of the file; 2. Use " sed '2,$d' -i aa.txt" command deletes all lines from line 2 to the end of the file.

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

linux How to delete the last few lines?

linux Delete the last few lines of the file:

1.

[root@server ~]# cat aa.txt
aaaa
bbbb
cccc
dddd
eeee

[root@server ~]# A=$(sed -n '$=' a.txt)
[root@server ~]# sed $(($ A-3+1)),${A}d a.txt

[root@server ~]# cat aa.txt
aaaa

Or use the above two commands. The last 3 lines are deleted.

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

2.

-i is to modify the original file. If no modification is needed, i is not needed.

Among them, sed '2,$d' -i aa.txt

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

Note:

Command one operates on the original file, and the result will be transferred to a newly generated file or printed to the screen;

Command two operates on the original file directly, and the result will be on the original file. The file was changed and the command results were produced.

Recommended learning: "linux video tutorial"

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