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Top Forums Shell Programming and Scripting Delete Blank Lines Between DHCP Host Blocks Post 302258746 by radoulov on Saturday 15th of November 2008 06:12:52 PM
Old 11-15-2008
If Perl is acceptable:

Code:
perl -i~ -ne'print if /{/../}/' dhcpd.conf

You may try the same with sed but you need an implementation that supports the i option:

Code:
sed -i~ -n '/{/,/}/p' dhcpd.conf

 

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

NAME
dhclient.leases - DHCP client lease database DESCRIPTION
The Internet Software Consortium DHCP client keeps a persistent database of leases that it has acquired that are still valid. The data- base 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 occurrance. The format of the lease declarations is described in dhclient.conf(5). FILES
/var/lib/dhcp/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 the Internet Software Consortium. Information about the Internet Software Consortium can be found at http://www.isc.org. dhclient.leases(5)
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