Grep command is not search the complete pattern Post: 302825869

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Top Forums Shell Programming and Scripting Grep command is not search the complete pattern Post 302825869 by rbatte1 on Tuesday 25th of June 2013 09:57:41 AM

06-25-2013

Moderator

It could be as simple as quoting your search string:-

Code:

grep -h "${INPUT_FILE_T}" PCF_STARHUB_20130625_1

It's an odd search string though. From the man page I have on RHEL 6.1, I have:-

Code:

A regular expression may be followed by one of several repetition operators:
      ?      The preceding item is optional and matched at most once.
      *      The preceding item will be matched zero or more times.
      +      The preceding item will be matched one or more times.
      {n}    The preceding item is matched exactly n times.
      {n,}   The preceding item is matched n or more times.
      {,m}   The preceding item is matched at most m times.
      {n,m}  The preceding item is matched at least n times, but not more than m times.

So that you mean that you are looking for a record that starts (doesn't have to be at the beginning of the line) with an S, then the H is optional and then I get confused.

Are you trying to use the ? as a single character each time?

I would think a better search string would be more like:-

Code:

INPUT_FILE_T="^SH....................................US"

to represent Start of line, SH, then any 3 characters, then US. The remainder of the line can be ignored.

Do either of these meet your needs?

Robin
Liverpool/Blackburn
UK

Last edited by rbatte1; 06-25-2013 at 10:59 AM.. Reason: Grammar

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ausearch_add_regex

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 a regular expression to the current audit search expression. The search conditions
       can then be used to scan logs, files, or buffers for something of interest. The regular	expression  follows  the  posix  extended  regular
       expression conventions, and is matched against the full record (without interpreting field values).

       If an existing search expression E is already defined, this function replaces it by (E && this_regexp).

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)

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