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Full Discussion: how to sed with tail
Top Forums UNIX for Dummies Questions & Answers how to sed with tail Post 82249 by zazzybob on Tuesday 30th of August 2005 05:27:01 AM
Old 08-30-2005
Using the shell, i'd do something convoluted like this
Code:
$ cat ./redlotus.sh
#!/bin/ksh

matchfile="redlotus.txt"

matches=`echo "${line}" | egrep -in "Error|Exception" ${matchfile}`
echo "${matches} " | while read line; do
   lineno=`echo "${line}" | cut -d: -f1`
   match=`echo "${line}" | cut -d: -f2`
   echo "Match found - line ${lineno} - ${match}"
   minline=$(( lineno - 5 ))
   [[ "$(( lineno - 5 ))" -lt 1 ]] && minline=1
   sed -n "$minline,$(( lineno - 1 ))p" ${matchfile}
   sed -n "$lineno p" ${matchfile}
   sed -n "$(( lineno + 1 )),$(( lineno + 5 ))p" ${matchfile}

   # note we could just do
   # sed -n "$minline, $((lineno + 5))p" ${matchfile}
   # but i've left this as-is to show you how to grab the previous, and the
   # next, five lines....
done
exit 0

No doubt, there is a far easier way (using -C option to GNU (e)grep for example)....

Cheers
ZB
 

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LEARN ABOUT FREEBSD

dwarf_undef_macro

DWARF_UNDEF_MACRO(3)					   BSD Library Functions Manual 				      DWARF_UNDEF_MACRO(3)

NAME

     dwarf_undef_macro -- record the removal of a macro definition

LIBRARY

     DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS

     #include <libdwarf.h>

     int
     dwarf_undef_macro(Dwarf_P_Debug dbg, Dwarf_Unsigned lineno, char *name, Dwarf_Error *err);

DESCRIPTION

     Function dwarf_undef_macro() records the removal of a macro definition in a DWARF producer instance.

     Argument dbg should reference a DWARF producer instance allocated using dwarf_producer_init(3) or dwarf_producer_init_b(3).

     Argument lineno specifies the line number of the source line where the macro definition was removed.  A value of zero indicates that the
     macro definition was removed before any source files were read.

     Argument name should point to a NUL-terminated string containing the name of the macro.

     If argument err is not NULL, it will be used to store error information in case of an error.

RETURN VALUES

     On success, function dwarf_undef_macro() returns DW_DLV_OK.  In case of an error, function dwarf_undef_macro() returns DW_DLV_ERROR and sets
     the argument err.

EXAMPLE

     To record the fact that the macro named _STDIO_H_ was removed at line 220 of the current macro file, use:

	   Dwarf_P_Debug dbg;
	   Dwarf_Error de;

	   /* ... Assume 'dbg' refers to a DWARF producer instance... */
	   if (dwarf_undef_macro(dbg, 220, "_STDIO_H_", &de) != DW_DLV_OK)
		   errx(EXIT_FAILURE, "dwarf_def_macro failed: %s",
		       dwarf_errmsg(-1));

ERRORS

     Function dwarf_undef_macro() can fail with:

     [DW_DLE_ARGUMENT]	Either arguments dbg or name was NULL.

     [DW_DLE_MEMORY]	An out of memory condition was encountered during the execution of the function.

SEE ALSO

     dwarf(3), dwarf_def_macro(3), dwarf_end_macro_file(3), dwarf_producer_init(3), dwarf_producer_init_b(3), dwarf_start_macro_file(3),
     dwarf_vendor_ext(3)

BSD
								 November 9, 2011							       BSD
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