02-27-2008
automating file search and replace text
Hi, I am trying something like this: Let's say I have a file called File1 with contents:
x=-0.3
y=2.1
z=9.0
I have another file, File2, with contents:
xx=
yy=
zz=
(nothing after "="). What I want to do is get the value of x in File1 and set it to xx in File2, i.e., xx=-0.3. And the same thing for y and z, value of y will be set to yy and z to zz (yy=2.1, zz=9.0).
Now, I want to do this with grep and sed and without using any other
language. Also, I cannot know the numbers in File1. The process should be automatic. Is there a way to do this in the command line itself? Only one step is enough, for example, x in File1 to xx in File2 step. thanks,
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LEARN ABOUT CENTOS
ausearch_add_item
AUSEARCH_ADD_ITEM(3) Linux Audit API AUSEARCH_ADD_ITEM(3)
NAME
ausearch_add_item - build up search rule
SYNOPSIS
#include <auparse.h>
int ausearch_add_item(auparse_state_t *au, const char *field, const char *op, const char *value, ausearch_rule_t how);
DESCRIPTION
ausearch_add_item adds one search 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 field value is the field name that the value will be checked for. The op variable
describes what kind of check is to be done. Legal op values are:
exists
just check that a field name exists
=
locate the field name and check that the value associated with it is equal to the value given in this rule.
!=
locate the field name and check that the value associated with it is NOT equal to the value given in this rule.
The value parameter is compared to the uninterpreted field value. If you are trying to match against a field who's type is
AUPARSE_TYPE_ESCAPED, you will want to use the ausearch_add_interpreted_item() function instead.
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.
SEE ALSO
ausearch_add_expression(3), ausearch_add_interpreted_item(3), ausearch_add_timestamp_item(3), ausearch_add_regex(3), ausearch_set_stop(3),
ausearch_clear(3), ausearch_next_event(3), ausearch-expression(5).
AUTHOR
Steve Grubb
Red Hat Feb 2012 AUSEARCH_ADD_ITEM(3)