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Top Forums UNIX for Dummies Questions & Answers file comparison...help needed. Post 302194458 by frozentin on Tuesday 13th of May 2008 01:25:02 AM
Old 05-13-2008
This suggestion depends on how big your second file is.

But, you could try to put all the entries of the 2nd file into a grep list and then loop thru the 1st file only once. This way you avoid multiple loops that I suggested in my last post.

One more way would be to attack the i/p file in chunks of say 1000 lines, and append o/p to file3/4.
 

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fstrcoll(3)						     Library Functions Manual						       fstrcoll(3)

NAME
fstrcoll - fuzzy comparison of two strings using the current locale SYNOPSIS
#include <fstrcmp.h> #define FSTRCMP_IDENTICAL #define FSTRCMP_THRESHOLD #define FSTRCMP_ERROR double fstrcoll(const char *string1, const char *string2); DESCRIPTION
The strcoll() function compares the two strings sting1 and string2. The comparison is based on strings interpreted as appropriate for the program's current locale for category LC_CTYPE. RETURN VALUE
The fstrcoll function returns a floating point value between 0.0 and FSTRCMP_IDENTICAL. A value of 0.0 means the strings are utterly un- alike. A value of FSTRCMP_IDENTICAL means the strings are identical. A value of more than FSTRCMP_THRESHOLD (it lies between 0.0 and FSTRCMP_IDENTICAL) would be considered "similar" by most people. A value of FSTRCMP_ERROR (always negative) indicates a malloc(3) or mbstowcs(3) failure. SEE ALSO
fstrcmp(3) fuzzy comparison of two strings fstrcolli(3) fuzzy comparison of two strings using the current locale strcoll(3) compare two strings using the current locale mbstowcs(3) convert a multibyte string to a wide-character string COPYRIGHT
fstrcmp version 0.4 Copyright (C) 2009 Peter Miller Peter Miller <pmiller@opensource.org.au> The comparison code is derived from the fuzzy comparison functions in GNU Gettext 0.17. The GNU Gettext comparison functions were, in turn, derived from GNU Diff 2.7. Copyright (C) 1988-2009 Free Software Foundation fstrcoll(3)
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