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Full Discussion: replace information in a file
Top Forums Shell Programming and Scripting replace information in a file Post 302478294 by cabrao on Tuesday 7th of December 2010 02:23:31 PM
Old 12-07-2010
There are many ways to do that, one of them is for instance if you know the number of line you want to update:
Code:
$ cat -n file
     1  #test
     2  server ntpserver_old prefer
     3  server ntpserver_old prefer

Code:
$ awk -v s=new_ntpservername 'NR==2 && /^server/{$2=s}1' file
#test
server new_ntpservername prefer
server ntpserver_old prefer

 

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LEARN ABOUT CENTOS

rping

RPING(1)							     librdmacm								  RPING(1)

NAME

       rping - RDMA CM connection and RDMA ping-pong test.

SYNOPSIS

       rping -s [-v] [-V] [-d] [-P] [-a address] [-p port]
		 [-C message_count] [-S message_size]
       rping -c [-v] [-V] [-d] -a address [-p port]
		 [-C message_count] [-S message_size]

DESCRIPTION

       Establishes  a  reliable  RDMA connection between two nodes using the librdmacm, optionally performs RDMA transfers between the nodes, then
       disconnects.

OPTIONS

       -s     Run as the server.

       -c     Run as the client.

       -a address
	      On the server, specifies the network address to bind the connection to.  On the client, specifies the server address to connect to.

       -p     Port number for listening server.

       -v     Display ping data.

       -V     Validate ping data.

       -d     Display debug information.

       -C message_count
	      The number of messages to transfer over each connection.	(default infinite)

       -S message_size
	      The size of each message transferred, in bytes.  (default 100)

       -P     Run the server in persistent mode.  This allows multiple rping clients to connect to a single server instance. The server  will  run
	      until killed.

NOTES

       Because	this  test maps RDMA resources to userspace, users must ensure that they have available system resources and permissions.  See the
       libibverbs README file for additional details.

SEE ALSO

       rdma_cm(7), ucmatose(1), udaddy(1), mckey(1)

librdmacm							    2007-05-15								  RPING(1)
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