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Top Forums UNIX for Beginners Questions & Answers Need help to use regex to do search and replace. Don't know how to and can't figure out how :( Post 303026958 by Don Cragun on Wednesday 5th of December 2018 02:27:26 PM
Old 12-05-2018
The following seems to do what you want just using standard sed features:
Code:
sed 's#\(/db/LTS/abc\)p\(_.*\.dbf\)#\1t\2#' file > file.$$ &&
    cp file.$$ file &&
    rm file.$$

The \1 and \2 in the replacement string in the substitute command are back references that are replaced by the strings matched by the BREs between the escaped sets of parentheses, respectively.

Using unescaped parentheses (as in RudiC's suggestion) is a GNU extension that is not allowed in the standards. The sed -r option is not included in the standards, but is allowed as an extension.

When I was using Solaris systems, I would have done this using /usr/xpg4/bin/sed, but I don't think there is anything in the above commands that won't work with /bin/sed or /usr/bin/sed.
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AUSEARCH_ADD_TIMESTAMP_ITEM(3)					  Linux Audit API				    AUSEARCH_ADD_TIMESTAMP_ITEM(3)

NAME
ausearch_add_timestamp_item - build up search rule SYNOPSIS
#include <auparse.h> int ausearch_add_timestamp_item(auparse_state_t *au, const char *op, time_t sec, unsigned milli, ausearch_rule_t how) DESCRIPTION
ausearch_add_timestamp_item adds an event time condition to the current audit search expression. The search conditions can then be used to scan logs, files, or buffers for something of interest. The op parameter specifies the desired comparison. Legal op values are <, <=, >=, > and =. The left operand of the comparison operator is the timestamp of the examined event, the right operand is specified by the sec and milli parameters. The how value determines how this search condition will affect the existing search expression if one is already defined. The possible val- ues are: AUSEARCH_RULE_CLEAR Clear the current search expression, if any, and use only this search condition. AUSEARCH_RULE_OR If a search expression E is already configured, replace it by (E || this_search_condition). AUSEARCH_RULE_AND If a search expression E is already configured, replace it by (E && this_search_condition). RETURN VALUE
Returns -1 if an error occurs; otherwise, 0 for success. APPLICATION USAGE
Use ausearch_add_item(3) and ausearch_add_interpreted_item(3) to add conditions that check audit record fields. Use ausearch_add_expres- sion(3) to add complex search expressions using a single function call. SEE ALSO
ausearch_add_expression(3), ausearch_add_item(3), ausearch_add_interpreted_item(3), ausearch_add_regex(3), ausearch_set_stop(3), ause- arch_clear(3), ausearch_next_event(3), ausearch-expression(5). AUTHOR
Miloslav Trmac Red Hat Nov 2007 AUSEARCH_ADD_TIMESTAMP_ITEM(3)
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