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Full Discussion: Pick the last one hour lines from log matching this pattern.
Top Forums Shell Programming and Scripting Pick the last one hour lines from log matching this pattern. Post 302843312 by bakunin on Monday 12th of August 2013 08:35:02 PM
Old 08-12-2013
Quote:
Originally Posted by santosh2626
Code:
grep '(date +['%-m/%-d/%y %H:%M:%S:%03N %Z'])' log_file_path

The first problem with your code is you used single quotes: everything within single quotes is treated as is, not evaluated. This will probably work, but only find the entries with the current timestamp, not the last hour:

Code:
grep "$(date +['%-m/%-d/%y %H:%M:%S:%03N %Z'])" log_file_path

You can get a timestamp from one hour before if you manipulate the TZ variable, which holds the timezone. For instance, i am on GMT+1. To get the timestamp from one hour before I'd use:

Code:
(TZ="GMT+1" ; date)    # current time
(TZ="GMT" ; date)      # one hour ago

Lastly, grep is a poor tool for what you want to achieve, because it filters single lines. What you want to match is a range of lines and for this sed is the tool of choice. Notice how the single quoted parts are ending and restarting again:

Code:
sed  -n '/^'"$(TZ=GMT ; date +['%-m/%-d/%y %H:%M:%S:%03N %Z'])"'/,$ p' log_file_path

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
santosh2626
 

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LEARN ABOUT V7

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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