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Full Discussion: sed: delete regex line and next line if blank
Top Forums Shell Programming and Scripting sed: delete regex line and next line if blank Post 302237648 by one71 on Thursday 18th of September 2008 05:22:01 AM
Old 09-18-2008
sed: delete regex line and next line if blank
Hi,

I want to write a sed script which from

Code:
batiato:

batiato/giubbe:
pip_b.2.txt
pip_b.3.txt
pip_b.3mmm.txt

bennato:

bennato/peterpan:
123.txt

consoli:
pip_a.12.txt

daniele:

daniele/anna:
abc.txt

procuces

Code:
batiato/giubbe:
pip_b.2.txt
pip_b.3.txt
pip_b.3mmm.txt

bennato/peterpan:
123.txt

consoli:
pip_a.12.txt

daniele/anna:
abc.txt

I would imagine something like:
"if a line containing ":" is followed by an empty line delete both lines (the line with ":" and the empty line)"
i.e. something like in general
if a line containing regex1 is followed (immediately after) by a line containing regex2 delete both lines.

if it would be on one line I would do: sed '/regex1.*regex2/d' -->
how to spread this command on 2 lines? And consider hat in my case regex2 is an empty line ( i.e. ^$).

thanks
 

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LEARN ABOUT DEBIAN

mac-vendor

MAC-VENDOR(5)							File Formats Manual						     MAC-VENDOR(5)

NAME

       mac-vendor - Ethernet vendor file for arp-scan

SYNOPSIS

       mac-vendor.txt

DESCRIPTION

       The  mac-vendor.txt  contains Ethernet MAC to vendor string mappings for arp-scan.  It is used in addition to the IEEE OUI and IAB listings
       in ieee-oui.txt and ieee-iab.txt.  It is for MAC-vendor mappings that are not covered by the IEEE manufacturer listings.

       Each line in the mac-vendor.txt file contains a MAC-vendor mapping in the form:

       <MAC-Prefix><TAB><Vendor>

       Where <MAC-Prefix> is the prefix of the MAC address in hex, and <Vendor> is the name of the vendor.  The prefix can be of any  length  from
       two  hex  digits  (one octet) to twelve hex digits (six octets, the entire Ethernet hardware address).  The alphabetic hex characters [A-F]
       must be entered in upper case.

       For example:
       012345	 would match 01:23:45:xx:xx:xx, where xx represents any value;
       0123456	 would match 01:23:45:6x:xx:xx; and
       01234567  would match 01:23:45:67:xx:xx.

       Blank lines and lines beginning with "#" are ignored.

       The order of entries in the file is not important.  arp-scan will attempt to match larger prefixes before trying to match smaller ones, and
       will stop at the first match.

FILES

       /usr/local/share/arp-scan/mac-vendor.txt

EXAMPLE

       # From nmap Debian bug report #369681 dated 31 May 2006
       525400  QEMU
       B0C420  Bochs

       # From RFC 2338: 00-00-5E-00-01-{VRID}
       00005E0001      VRRP (last octet is VRID)

       # Microsoft WLBS (Windows NT Load Balancing Service)
       # http://www.microsoft.com/technet/prodtechnol/acs/reskit/acrkappb.mspx
       02BF    Microsoft WLBS (last four octets are IP address)

AUTHOR

       Roy Hills <Roy.Hills@nta-monitor.com>

SEE ALSO

       arp-scan(1)

       get-oui(1)

       get-iab(1)

       arp-fingerprint(1)

       http://www.nta-monitor.com/wiki/ The arp-scan wiki page.

								  March 30, 2007						     MAC-VENDOR(5)
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