topic Re: replace $2 using sed in Operating System - HP-UX

replace $2 using sed

lawrenzo_1 — Mon, 06 Apr 2009 13:28:37 GMT

Hello,

is it possible to change the value of $2 using sed?

ie

MGTSYS=myserver

sed -e "/^server/ s/$2/${MGTSYS}/" etc/ntp.conf

??

Thanks

Chris.

Re: replace $2 using sed

RUET — Mon, 06 Apr 2009 13:34:54 GMT

lawrenzo
by $2 , you mean second column ?

Re: replace $2 using sed

T G Manikandan — Mon, 06 Apr 2009 13:38:56 GMT

awk -F " " '/^server/ {$2="myserver";print }' ntp.conf

Re: replace $2 using sed

James R. Ferguson — Mon, 06 Apr 2009 13:46:45 GMT

Hi Chris:

I suspect you mean:

# sed -e "s/$server $$.*$/\1${MGTSYS}/" /etc/ntp.conf

...as to change lines like:

server chris.xyz.com

to:

server lawrenzo.xyz.com

Regards!

...JRF...

Re: replace $2 using sed

RUET — Mon, 06 Apr 2009 14:07:19 GMT

if you really want sed :

cat ntp.conf| sed "/^server/s/$server$ $.*$/\1 ${MGTSYS}/"

Re: replace $2 using sed

James R. Ferguson — Mon, 06 Apr 2009 14:13:27 GMT

Hi:

> P.R. if you really want sed :

The 'cat' is useless overhead. Sed is quite capable of reading a file from the command line. You only added a useless process and an additional read and write of the input file into a pipe!

...JRF...

Re: replace $2 using sed

RUET — Mon, 06 Apr 2009 14:20:09 GMT

James

yes of course cat is not mandatory .. it was just a way of do it ..
you are right , sed can do the job alone ..

pat

Re: replace $2 using sed

lawrenzo_1 — Mon, 06 Apr 2009 14:28:55 GMT

ok got that - quite complex answers but something I can work with.

Thanks all

Chris.

Re: replace $2 using sed

lawrenzo_1 — Mon, 06 Apr 2009 14:29:12 GMT

ty.