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Full Discussion: How to print line if two lines above it matches patterns.?
Top Forums Shell Programming and Scripting How to print line if two lines above it matches patterns.? Post 302958427 by Don Cragun on Thursday 22nd of October 2015 03:39:32 AM
Old 10-22-2015
Perhaps you want something like:
Code:
awk '
$2 == "<CLIENT>" {
	m = 1
	next
}
m == 1 && $2 == "<No>" {
	m = 2
	next
}
m == 2 {print $2
}
{	m = 0
}' file

If file contains:
Code:
[12:16:30.901]  <CLIENT>
[12:16:30.901]          <No>
[12:16:30.901]          1234
[12:16:30.901]          </No>
[12:16:30.901]  </CLIENT>
[12:16:30.901]  <CLIENT>
[12:16:30:901]          <NotNo>
[12:16:30.901]          1235
[12:16:30.901]          </NotNo>
[12:16:30.901]  </CLIENT>
[12:16:30.901]  <CLIENT>
[12:16:30:901]          <NotNo>
[12:16:30.901]          1236
[12:16:30.901]          </NotNo>
[12:16:30.901]          <No>
[12:16:30.901]          1237
[12:16:30.901]          </No>
[12:16:30.901]  </CLIENT>
....

it produces the output:
Code:
1234

which, I believe, matches what you said you wanted.

If you want to try this on a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk or nawk.
 

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LEARN ABOUT CENTOS

fail2ban-regex

FAIL2BAN-REGEX(1)						   User Commands						 FAIL2BAN-REGEX(1)

NAME

       fail2ban-regex - test Fail2ban "failregex" option

SYNOPSIS

       fail2ban-regex [OPTIONS] <LOG> <REGEX> [IGNOREREGEX]

DESCRIPTION

       Fail2Ban  reads log file that contains password failure report and bans the corresponding IP addresses using firewall rules.

       This tools can test regular expressions for "fail2ban".

   LOG:
       string a string representing a log line

       filename
	      path to a log file (/var/log/auth.log)

       "systemd-journal"
	      search systemd journal (systemd-python required)

   REGEX:
       string a string representing a 'failregex'

       filename
	      path to a filter file (filter.d/sshd.conf)

   IGNOREREGEX:
       string a string representing an 'ignoreregex'

       filename
	      path to a filter file (filter.d/sshd.conf)

OPTIONS

       --version
	      show program's version number and exit

       -h, --help
	      show this help message and exit

       -c CONFIG, --config=CONFIG
	      set alternate config directory

       -d DATEPATTERN, --datepattern=DATEPATTERN
	      set custom pattern used to match date/times

       --timezone=TIMEZONE, --TZ=TIMEZONE
	      set time-zone used by convert time format

       -e ENCODING, --encoding=ENCODING
	      File encoding. Default: system locale

       -r, --raw
	      Raw hosts, don't resolve dns

       --usedns=USEDNS
	      DNS specified replacement of tags <HOST> in regexp ('yes' - matches all form of hosts, 'no' - IP addresses only)

       -L MAXLINES, --maxlines=MAXLINES
	      maxlines for multi-line regex.

       -m JOURNALMATCH, --journalmatch=JOURNALMATCH
	      journalctl style matches overriding filter file.	"systemd-journal" only

       -l LOG_LEVEL, --log-level=LOG_LEVEL
	      Log level for the Fail2Ban logger to use

       -v, --verbose
	      Increase verbosity

       --verbosity=VERBOSE
	      Set numerical level of verbosity (0..4)

       --verbose-date, --VD
	      Verbose date patterns/regex in output

       -D, --debuggex
	      Produce debuggex.com urls for debugging there

       --print-no-missed
	      Do not print any missed lines

       --print-no-ignored
	      Do not print any ignored lines

       --print-all-matched
	      Print all matched lines

       --print-all-missed
	      Print all missed lines, no matter how many

       --print-all-ignored
	      Print all ignored lines, no matter how many

       -t, --log-traceback
	      Enrich log-messages with compressed tracebacks

       --full-traceback
	      Either to make the tracebacks full, not compressed (as by default)

AUTHOR

       Written by Cyril Jaquier <cyril.jaquier@fail2ban.org>.  Many contributions by Yaroslav O. Halchenko and Steven Hiscocks.

REPORTING BUGS

       Report bugs to https://github.com/fail2ban/fail2ban/issues

COPYRIGHT

       Copyright (C) 2004-2008 Cyril Jaquier, 2008- Fail2Ban Contributors
       Copyright of modifications held by their respective authors.  Licensed under the GNU General Public License v2 (GPL).

SEE ALSO

       fail2ban-client(1) fail2ban-server(1)

fail2ban-regex 0.10.2						   January 2018 						 FAIL2BAN-REGEX(1)
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