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Top Forums Shell Programming and Scripting Grep a log file starting from a specific time to the end of file Post 303021654 by stomp on Tuesday 14th of August 2018 07:18:27 AM
Old 08-14-2018
Since you did not specify your environment, I assume Linux/Bash.



You may convert the timestamp to epoch(= time in seconds since 1.1.1970) and print only the lines where the value is higher:


Code:
start_date="July 29 2018 21:00:00"

start_seconds="$(date +"%s" --date="$start_date")"
while read month day year time rest;do 

   current_line_seconds=$(date +"%s" --date="$month $day $year $time")
   [ $current_line_seconds -gt $start_seconds ] && \
       echo "$month $day $year $time $rest"; 
done <your_data_file.txt

Performance of this solution is only suited for small file sizes since one process is spawned for every line.
 

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SVK::Log::Filter::Grep(3)				User Contributed Perl Documentation				 SVK::Log::Filter::Grep(3)

SYNOPSIS
SVK::Log::Filter::Grep - search log messages for a given pattern DESCRIPTION
The Grep filter requires a single Perl pattern (regular expression) as its argument. The pattern is then applied to the svn:log property of each revision it receives. If the pattern matches, the revision is allowed to continue down the pipeline. If the pattern fails to match, the pipeline immediately skips to the next revision. The pattern is applied with the /i modifier (case insensitivity). If you want case-sensitivity or other modifications to the behavior of your pattern, you must use the "(?imsx-imsx)" extended pattern (see "perldoc perlre" for details). For example, to search for log messages that match exactly the characters "foo" you might use svk log --filter "grep (?-i)foo" However, to search for "foo" without regards for case, one might try svk log --filter "grep foo" The result of any capturing parentheses inside the pattern are not available. If demand dictates, the Grep filter could be modified to place the captured value somewhere in the stash for other filters to access. If the pattern contains a pipe character ('|'), it must be escaped by preceding it with a '' character. Otherwise, the portion of the pattern after the pipe character is interpreted as the name of a log filter. STASH
/PROPERTY MODIFICATIONS Grep leaves all properties and the stash intact. perl v5.10.0 2008-08-04 SVK::Log::Filter::Grep(3)
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