Sed cannot remove line ending in a pattern

[TitoHL]

Hi guys:
I am learning to create scripts, but I've had troubles with SED command. In particular, when I try delete a line that ends with a pattern.
My example is, boot.txt, a text file that contains three lines:


[ 16518 2014-09-23 16:09] /boot/grub/grub.cfg
[ 1024 2014-10-02 14:49] /boot/grub/grubenv
[ 1024 2014-10-02 14:49] /boot/grub/grubenvx
According to the documentation, to remove only the 2nd line (ends with grubenv), I would use the following command:

sed -e '/grubenv$/d' boot.txt > boot2.txt
Theoretically, the result should be that boot2.txt containing:


[ 16518 2014-09-23 16:09] /boot/grub/grub.cfg
[ 1024 2014-10-02 14:49] /boot/grub/grubenvx
However, the result is that the content of boot2.txt remains the same boot.txt.
What am I doing wrong?
In advance, thank you very much.
PS: I know you can use other commands to do this, but my intention is to learn to use either the SED command.

[matt_symes]

Hi

I can see much wrong.



matthew-laptop:/home/matthew:0 % ls test*
test
matthew-laptop:/home/matthew:0 % cat test
[ 16518 2014-09-23 16:09] /boot/grub/grub.cfg
[ 1024 2014-10-02 14:49] /boot/grub/grubenv
[ 1024 2014-10-02 14:49] /boot/grub/grubenvx
matthew-laptop:/home/matthew:0 % sed -e '/grubenv$/d' test > test2
matthew-laptop:/home/matthew:0 % ls test*
test test2
matthew-laptop:/home/matthew:0 % cat test2
[ 16518 2014-09-23 16:09] /boot/grub/grub.cfg
[ 1024 2014-10-02 14:49] /boot/grub/grubenvx
matthew-laptop:/home/matthew:0 %


The only thing i have changed are the filenames. Linux filenames don't usually require extensions. Maybe i should strike out that last comment in the programming sub-forum :)

You are running the commands on a Ubuntu box ? The file boot.txt was created on a Ubuntu box ?

Kind regards

[ofnuts]

I don't think file extensions are the problem, but some overlooked space character between grubenv and the EOL would cause the problem.


sed -e '/grubenv\s*$/d' boot.txt

would take care of any number of feral spaces/tabs at the end of the line.

[TitoHL]

Ofnuts, you hit the bulls-eye!
Trouble solved.
Thank you very much.
Too, thanks Mattew for try to helpme.
Greetings from Chile.

[matt_symes]

Hi


I don't think file extensions are the problem.

LOL. Yeah. That's not what i meant by that comment.

But anyway, good catch there sir. :)

Kind regards