topic Re: need sed help in Operating System - HP-UX

need sed help

LAFDAL_1 — Fri, 09 Dec 2005 08:58:20 GMT

I want to delete lines from a file, from the first line to the first occurrence of a string XXXXX within the file.
Can you help me to give me the sed right command to do this.
thanks.

Re: need sed help

James R. Ferguson — Fri, 09 Dec 2005 09:03:06 GMT

Hi:

By example:

# sed -ne '1,/localhost/d;p' /etc/hosts

Change /localhost/ to the pattern you want to match, and (obviously) substitute your file name for '/etc/hosts'.

Regards!

..JRF...

Re: need sed help

Tom Ward_1 — Fri, 09 Dec 2005 09:10:52 GMT

Here's another way

sed -n '1,/XXXX/!p' filename

Regards,
Tom

Re: need sed help

LAFDAL_1 — Fri, 09 Dec 2005 09:45:29 GMT

Thanks,
it works fine.
But how can i do if the string "localhost" is a variable. That is declared as $localhost

Re: need sed help

James R. Ferguson — Fri, 09 Dec 2005 10:03:22 GMT

Hi:

OK, do this:

# pat=localhost;sed -ne "1,/$pat/!p" /etc/hosts

Note the use of the double quote marks.

Regards!

...JRF...

Re: need sed help

LAFDAL_1 — Fri, 09 Dec 2005 13:15:05 GMT

Ok thanks
It works fine.

Re: need sed help

Arturo Galbiati — Mon, 12 Dec 2005 04:20:47 GMT

Hi,
just a note: the command
sed -ne "1,/$pat/!p" /etc/hosts
runs fine but doens't remove the entry in the /etc/hosts file. It simply show at the screen the result.
To remove them to have to use:

sed -ne "1,/$pat/!p" /etc/hosts>tt
mv tt /etc/hosts

Rgds,
Art