sed to edit grub.cfg

essahar · 01-05-2021, 11:16 PM

Hello, Is there a way using sed command to delete all menuentry title in grub. the section should be

Quote:

menuentry title OS version ...
{ kernel and initial ramdisk parameter line1
kernel and initial ramdisk parameter line2
...
...
}

I want to delete the all line menuentry and what is after between the brackets

syg00 · 01-06-2021, 01:08 AM

Of course there is a way - several probably.

Why do you want to ?. Do you know the potential consequences ?. If you break grub your system usually becomes unbootable. That is your responsibility, not anyone here who may have helped.

essahar · 01-06-2021, 01:44 AM

Quote:

Originally Posted by syg00

Of course there is a way - several probably.

Why do you want to ?. Do you know the potential consequences ?. If you break grub your system usually becomes unbootable. That is your responsibility, not anyone here who may have helped.

I know what I'm doing I'll remove all the old entries then use the command new-kernel-pkg to add customs one with special kernel option and title. I have removed these entries manually and it is working.

syg00 · 01-06-2021, 02:20 AM

Quote:

Originally Posted by essahar

I know what I'm doing

In which case I'll desist.

shruggy · 01-06-2021, 02:46 AM

Your profile says RHEL, but it shows the Ubuntu logo. In RHEL, the standard helper tool to deal with GRUB configuration from a shell script is grubby.

essahar · 01-06-2021, 04:12 AM

Quote:

Originally Posted by shruggy

Your profile says RHEL, but it shows the Ubuntu logo. In RHEL, the standard helper tool to deal with GRUB configuration from a shell script is grubby.

I'm using RedHat and I need a command line like sed to be used in a script not a graphical tool

shruggy · 01-06-2021, 04:20 AM

It's not a graphical tool. Have you checked its manpage?

petelq · 01-06-2021, 08:00 AM

Quote:

Originally Posted by essahar

I'm using RedHat and I need a command line like sed to be used in a script not a graphical tool

You can use chmod to remove the x from all the files in /etc/grub.d/ that you don't want in grub.cfg.
I have a script that does this for everything then puts it back for the ones I want. I just want 00_header and 90_persistent (or you could include 40_custom).
I do this whenever there is a grub update.
I probably should point out I still have mbr bootloading.

ondoho · 01-06-2021, 09:51 AM

Wouldn't it be better to see how grub generates grub.cfg in the first place, and try to keep it from doing that?

Just my €

shruggy · 01-06-2021, 11:31 AM

@OP. Is this your thread on CentOS forums?