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Full Discussion: Issue with grep
Top Forums Shell Programming and Scripting Issue with grep Post 302622681 by digitalviking on Thursday 12th of April 2012 12:32:46 PM
Old 04-12-2012
Issue with grep

Hi there,

I need to grep out 1 line of a changing file. Any help would be much appreciated.

code:

Code:
xterm -hold -e tail -f /var/lib/dhcp3/dhcpd.leases | grep client-hostname &>/dev/null &

The trouble is it shows the contents of the entire lease file.

I just want to show the line starting with client-hostname or even better just the host name so in the case below it just shows computer01
Code:
lease 10.0.0.11 {
  starts 4 2012/04/12 16:25:30;
  ends 4 2012/04/12 16:35:30;
  cltt 4 2012/04/12 16:25:30;
  binding state active;
  next binding state free;
  hardware ethernet XX:XX:XX:XX:XX:XX;
  uid "\001\000\034\263|>\330";
  client-hostname "Computer01";
}

Thank you in advance

DV

Moderator's Comments:
Mod Comment Code tags for code, please.

Last edited by Corona688; 04-12-2012 at 01:53 PM..
 

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dhclient.leases(5)						File Formats Manual						dhclient.leases(5)

NAME
dhclient.leases - DHCP client lease database DESCRIPTION
The Internet Systems Consortium DHCP client keeps a persistent database of leases that it has acquired that are still valid. The database is a free-form ASCII file containing one valid declaration per lease. If more than one declaration appears for a given lease, the last one in the file is used. The file is written as a log, so this is not an unusual occurrence. The format of the lease declarations is described in dhclient.conf(5). FILES
/var/lib/dhclient/dhclient.leases SEE ALSO
dhclient(8), dhcp-options(5), dhclient.conf(5), dhcpd(8), dhcpd.conf(5), RFC2132, RFC2131. AUTHOR
dhclient(8) was written by Ted Lemon under a contract with Vixie Labs. Funding for this project was provided by Internet Systems Consor- tium. Information about Internet Systems Consortium can be found at https://www.isc.org. dhclient.leases(5)
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