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Top Forums UNIX for Dummies Questions & Answers Grep for NULL for a specific field in a unix file Post 302097378 by sayonm on Friday 24th of November 2006 12:56:31 AM
Old 11-24-2006
i think ask.jackal was right...but the exact output that sureshg_sampat wanted was
Code:
awk -F'|' '{ if ($4 ~ /NULL/ || length($4)==0 ) print $0} filename'

just a small change... Smilie
 

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GENDERS_PARSE(3)						    LIBGENDERS							  GENDERS_PARSE(3)

NAME
genders_parse - determine errors with a genders file SYNOPSIS
#include <genders.h> int genders_parse(genders_t handle, const char *filename, FILE *stream); DESCRIPTION
genders_parse() parses the genders file indicated by filename and outputs information to stream about parse errors in the genders file. If filename is NULL, the default genders file will be checked. If stream is NULL, information will be output to standard error. RETURN VALUES
On success, the number of parse errors discovered is returned. If there are no errors, 0 is returned. On error, -1 is returned, and an error code is returned in handle. The error code can be retrieved via genders_errnum(3) , and a description of the error code can be retrieved via genders_strerror(3). Error codes are defined in genders.h. ERRORS
GENDERS_ERR_NULLHANDLE The handle parameter is NULL. The genders handle must be created with genders_handle_create(3). GENDERS_ERR_OPEN The genders file indicated by filename cannot be opened for reading. GENDERS_ERR_OVERFLOW A line in the genders database exceeds the maximum allowed length. GENDERS_ERR_MAGIC handle has an incorrect magic number. handle does not point to a genders handle or handle has been destroyed by genders_han- dle_destroy(3). FILES
/usr/include/genders.h SEE ALSO
libgenders(3), genders_handle_create(3), genders_errnum(3), genders_strerror(3) LLNL
August 2003 GENDERS_PARSE(3)
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