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Full Discussion: awk find a string, print the line 2 lines below it
Top Forums Shell Programming and Scripting awk find a string, print the line 2 lines below it Post 302465147 by mglenney on Thursday 21st of October 2010 05:51:37 PM
Old 10-21-2010
awk find a string, print the line 2 lines below it
I am parsing a nagios config, searching for a string, and then printing the line 2 lines later (the "members" string). Here's the data:

Code:
define hostgroup{
    hostgroup_name    chat-dev
    alias        chat-dev
    members        thisisahostname
    }

define hostgroup{
    hostgroup_name    chat-qa
    alias        chat-qa
    members        thisisadifferenthostname
    }

I have the following one-liner which works:

Code:
$ awk -v hgn="chat-qa" '{ if ($1 == "hostgroup_name" && $2 == hgn ) { getline;getline;print $0 } }' testfile
    members        thisisadifferenthostname

Is there a better way to do this? First, the double getline seems a little cheesy to me. Second, what I'd really like to do is, once I find my string, search line by line after it until you find a line in which $1=="member" and then print that line. That way, if that line isn't exactly 2 lines later I'll still find it.

Thanks,

MG
 

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LEARN ABOUT HPUX

ppp.dialers

ppp.Dialers(4)						     Kernel Interfaces Manual						    ppp.Dialers(4)

NAME

       ppp.Dialers - PPP dialer description file format

DESCRIPTION

       The  file  describes how to dial each type of modem attached to the UNIX system that is to be made available for outbound PPP calls.  exam-
       ines it when placing a call to a neighboring machine.

       When selects a line from it uses the field to select an entry in from which it uses the field to select an entry  in  then  interprets  the
       field from that dialer description.

   Format
       Entries	are  one  to a line; blank lines are ignored.  Comments begin with a and extend to the end of the line.  Upper/lower case distinc-
       tions in the dialer field are significant for matching purposes, as are strings in the chat script.  Fields on a line are separated by hor-
       izontal	white  space  (blanks  or  tabs).   If	a chat script ends with a backslash the next line is considered a continuation of the chat
       script.	Continuations may only occur in the midst of a chat script.

       Each entry must contain these fields, in this order:

       dialer	    The name of this dialer, to be matched against the dialer field in

       chat-script  A description of the conversation that holds with the modem.

   Chat Script Particulars
       A chat script takes the form of a space-separated list of expect-send pairs.  Each pair consists (at minimum) of a field to expect the  end
       to send, then a field to send in response.  Unless a string ends with will follow it by sending a carriage return character (ASCII 0x0d).

       Chat scripts are or where the following the hyphen is executed if the preceding fails to match received text.

       Certain	special words may be used in the chat script to control the behavior of as it attempts to dial.  Both ABORT and TIMEOUT must be in
       the phase of the chat script.

	      If		       sees abort-string while executing the remainder of the chat script, abort the dialing attempt and note  the
				       failure in the log file.

	      While executing the current chat script, wait timeout-time
				       seconds	for  a	response  before  considering  the dialing attempt to have timed out.  Writes have a fixed
				       60-second timeout.

       The expect-send couplet of 'sets the line parity accordingly:

	      Set transmission parity based on the parity observed in characters
			received in strings.  This is the default.

	      Transmit characters with the parity bit set to zero (8 bits, no parity).

	      Transmit characters with the parity bit set to one.

	      Transmit characters with even parity.

	      Transmit characters with odd parity.

       In the midst of either an string or a string, gets translated into the appropriate control character, and gets translated  into	x.   Other
       special sequences are:

	      Send or receive a space character (ASCII 0x20).

	      Send or receive a horizontal tab character (ASCII 0x09).

	      Send or receive a line feed character (ASCII 0x0a).

	      Send or receive a carriage return character (ASCII 0x0d).

	      Send or receive a backslash character (ASCII 0x5c).

	      Send or receive a carat character (ASCII 0x5e).

	      Send or receive the single character Ctrl-character (ASCII 0x00
			  through 0x1f).

	      Send or receive a character, specified in octal digits.

	      Pause for .25 second before proceeding (send only).

	      Delay for two seconds before proceeding (send only).

	      Send a break (.25 second of zero bits).

	      Disable hangups (sets CLOCAL or LNOHANG).

	      enable hangups (unsets CLOCAL or LNOHANG) (the default).

	      Don't append a carriage return character after sending the preceding string (send only).

	      Don't print succeeding send strings (e.g., a password) in any
			  debugging or logging output.	Subsequent sequences toggle mode.

	      Insert the telephone number (found in the fifth field of
			  here.

EXAMPLES

	      #
	      #       Dialers - PPP dialers file
	      #
	      #Dialer Chat script
	      T1600   ABORT NOsCARRIER ABORT NOsDIALTONE ABORT BUSY 
		      ABORT RRING

RRING

RRING 
		      ABORT ERROR TIMEOUT 5 "" AT OK-AT-OK 
		      ATS111=0DTT TIMEOUT 30 CONNECT
	      #
	      T2500-PEP 
		      ABORT NOsCARRIER ABORT NOsDIALTONE ABORT BUSY 
		      ABORT RRING

RRING

RRING 
		      ABORT ERROR TIMEOUT 5 "" AT OK-AT-OK 
		      ATS111=0DTT TIMEOUT 30 CONNECTsFAST
	      #
	      USRv32bis 
		      ABORT ERROR ABORT NOsANSWER ABORT NOsCARRIER 
		      ABORT BUSY ABORT RRING

RRING

RRING 
		      ABORT NOsDIALsTONE TIMEOUT 5 "" AT&F 
		      OK-ATQ0-OK ATB0E0X7&B1&H1&I0&K3&R2&S1 OK-AT-OK 
		      ATS01=1S02=255S19=0 OK-AT-OK ATDTT TIMEOUT 30 
		      CONNECT

AUTHOR

       was developed by the Progressive Systems.

SEE ALSO

       pppd(1), ppp.Auth(4), ppp.Devices(4), ppp.Filter(4), ppp.Keys(4), ppp.Systems(4).

       RFC 1055.  RFC 1144, RFC 1332, RFC 1548,

																    ppp.Dialers(4)
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