search and replace fixed length record file


 
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Old 08-06-2009
search and replace fixed length record file

Hi

I need to be search a file of fixed length records and when I hit a particular record that match a search string, substitute a known position field

In the example file below

FHEAD000000000120090806143011
THEAD0000000002Y0000000012 P00000000000000001234
TTAIL0000000003
THEAD0000000004Y0000000044 N00000000000000001299
TTAIL0000000005

I need to only consider the THEAD records and swap the Ps to Ns, and visa versa, in position 40,

Thanks in advance
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AUSEARCH_ADD_REGEX(3)						  Linux Audit API					     AUSEARCH_ADD_REGEX(3)

NAME
ausearch_add_regex - use regular expression search rule SYNOPSIS
#include <auparse.h> int ausearch_add_regex(auparse_state_t *au, const char *expr); DESCRIPTION
ausearch_add_regex adds one search condition based on regular expressions to the audit search API. The search conditions can then be used to scan logs, files, or buffers for something of interest. You may not use this in combination with any other search expression. The regu- lar expression follows the posix regular expression conventions. The search results are at the record level and not the field. RETURN VALUE
Returns -1 if an error occurs; otherwise, 0 for success. SEE ALSO
ausearch_add_expression(3), ausearch_add_item(3), ausearch_clear(3), ausearch_next_event(3), regcomp(3). AUTHOR
Steve Grubb Red Hat Sept 2007 AUSEARCH_ADD_REGEX(3)