How to grep logs for errors and receive specific additional lines? Post: 302855779

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Top Forums Shell Programming and Scripting How to grep logs for errors and receive specific additional lines? Post 302855779 by Don Cragun on Friday 20th of September 2013 09:56:56 PM

09-20-2013

Registered User

I was just confused because you said you wanted 10 lines of context before the SEVERE line, but your sample output provided 8 lines instead of 10.

The following awk script seems to do what you requested (with 10 lines of context):

Code:

awk -F"[][]" '
# pc() -- print context
# print up to 11 lines of context and clear context.
function pc(    i) {
        for(i = (lc > 10) ? lc - 10 : 1; i <= lc; i++)
                print l[i]
        lc = 0
}
!/^[1-9][0-9]{3}-[01][0-9]-[0-3][0-9]/ {
        nts = 1 # we have found a line with No Time Stamp
        if(severe) {
                pc()    # print context
                print   # print this line (which follows the SEVERE tag).
        }
        next
}
/^[1-9][0-9]{3}-[01][0-9]-[0-3][0-9]/ {
        if(nts) 
                # 1st line after one or more lines with no time stamp...
                severe = nts = lc = 0
        l[++lc] = $0
        if($2 == "SEVERE") severe = 1
}' /minecraft/server.log

If you want to run this on a Solaris/SunOS system, use /usr/xpg4/bin/awk, /usr/xpg6/bin/awk, or nawk instead of awk.

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LEARN ABOUT DEBIAN

xpinputselected

XpInputSelected(3Xp)						 XPRINT FUNCTIONS					      XpInputSelected(3Xp)

NAME

       XpInputSelected - Queries which X Print events the client has selected to receive from the specific print context.

SYNOPSIS

	     cc [ flag... ] file... -lXp [ library... ]
	     #include <X11/extensions/Print.h>

       unsigned long XpInputSelected ( display, context, event_mask )
	     Display *display;
	     XPContext context;
	     unsigned long *all_event_mask_return;

ARGUMENTS

       display
	      Specifies a pointer to the Display structure; returned from XOpenDisplay.

       context
	      Specifies the print context to which the query is being made.

       all_event_mask_return
	      Returns the set of events that any client has selected.

DESCRIPTION

       XpInputSelected	returns  a  bit  mask  describing  which  event  classes  the  client  has  selected  to  receive.  The  value returned to
       all_event_mask_return is the union of every client's event mask.  XpInputSelected queries which X Print events  from  the  specified  print
       context	the  client  has  selected to receive. The X Print Events are generated from a print context, and not from a window as is the case
       with XSelectInput. As events arrive, the context field in the event is used to determine which print context generated the event.  See XpS-
       electInput for the event_mask and all_event_mask (??return??) values.

DIAGNOSTICS

       XPBadContext   The specified print context is not valid.

SEE ALSO

       XpSelectInput(3Xp)

X Version 11							    libXp 1.0.0 					      XpInputSelected(3Xp)

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