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Top Forums Shell Programming and Scripting How to tail sed and awk in one line? Post 302983556 by RavinderSingh13 on Thursday 13th of October 2016 02:08:06 AM
Old 10-13-2016
Hello baris35,

If you want to continuously read the lines and search for a string and put that's matched line's first field to an output_file then following may help you too in same.
Code:
tail -f /var/log/apache2/access.log | awk '/TEST1/{print $1 >> "Output_file"}'

When you are done with tailing the logs(You could come out of above command) then you could check the file named Output_file for matched logs.

NOTE: In above command you could change search string from TEST1to your required text.

Thanks,
R. Singh

Last edited by RavinderSingh13; 10-13-2016 at 06:59 AM.. Reason: Added more clear comment "come out of that command" so that I could justify my statement "when you are done with tailing log"
This User Gave Thanks to RavinderSingh13 For This Post:
 

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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 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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