replace $2 using sed

[lawrenzo_1]

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.

[RUET]

lawrenzo
by $2 , you mean second column ?

[T G Manikandan · Accepted solution]

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

[James R. Ferguson]

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...

[RUET]

if you really want sed :

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

[James R. Ferguson]

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...

[RUET]

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

[lawrenzo_1]

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

Thanks all

Chris.

[lawrenzo_1]

ty.