pattern matching over multiple lines and deleting the first


 
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# 8  
Old 11-06-2009
Or something like this:

Code:
$
$ cat -n tst.log
     1  blah
     2  blah
     3  Uplink traffic:
     4  Downlink traffic:
     5  blah
     6  Uplink traffic:
     7  Downlink traffic:
     8  Uplink traffic:
     9  Dropped packets: 40
    10  Downlink traffic:
    11  blah
    12  blah
$
$ perl -ne 'BEGIN{undef $/} $x=$_; END{$x=~s/Uplink.*?\nDownlink/Downlink/g; print $x}' tst.log
blah
blah
Downlink traffic:
blah
Downlink traffic:
Uplink traffic:
Dropped packets: 40
Downlink traffic:
blah
blah
$
$

tyler_durden
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MAILSNARF(8)						      System Manager's Manual						      MAILSNARF(8)

NAME
mailsnarf - sniff mail messages in Berkeley mbox format SYNOPSIS
mailsnarf [-i interface | -p pcapfile] [[-v] pattern [expression]] DESCRIPTION
mailsnarf outputs e-mail messages sniffed from SMTP and POP traffic in Berkeley mbox format, suitable for offline browsing with your favorite mail reader (mail(1), pine(1), etc.). OPTIONS
-i interface Specify the interface to listen on. -p pcapfile Process packets from the specified PCAP capture file instead of the network. -v "Versus" mode. Invert the sense of matching, to select non-matching messages. pattern Specify regular expression for message header/body matching. expression Specify a tcpdump(8) filter expression to select traffic to sniff. SEE ALSO
dsniff(8), mail(1), pine(1) AUTHOR
Dug Song <dugsong@monkey.org> MAILSNARF(8)