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Top Forums Shell Programming and Scripting Should pick latest file within past 3 days using UNIX script and perform steps in message below. Post 303008677 by sunnykamal59 on Monday 4th of December 2017 10:35:29 PM
Old 12-04-2017
Thanks for your reply .Can you please please explain(step by step) in detail?I'm new to scripting.

*When i try to execute MIDNIGHT=$(date -d 0:0 +'%s') the result is '1512363600' . what is this number?is it the date?

*((THREEDAYSAGO=MIDNIGHT - 3*3600*24)) ..why we are doing 3*36*24?

*if we have 3 files selected in 3 days ,each file might have different string in line no#19 position 31,we should only select the file which has text ‘S A M P L E’ in the file.how we are doing this?

*And also can you explain this logic:

Code:
for file in *_*_*.dat
do
   FILESTAMP=${file#*_}
   FILESTAMP=${FILESTAMP%_*}
   if [[ $(date -d $FILESTAMP +'%s') -ge $THREEDAYSAGO ]]
   then
       awk '
           NR==19{
              if (substr($0,31,11) == "S A M P L E")
                 EC=1
              exit
           }
           END { exit EC }' $file

Moderator's Comments:
Mod Comment Please use CODE tags (as required by forum rules) when displaying sample input, sample output, and code segments.

Last edited by Don Cragun; 12-05-2017 at 12:46 AM.. Reason: Add CODE and ICODE tags.
 

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RAKE(1) 						 Ruby Programmers Reference Guide						   RAKE(1)

NAME
rake -- Ruby Make SYNOPSIS
rake [--f Rakefile] [--version] [-CGNPgnqstv] [-D [PATTERN]] [-E CODE] [-I LIBDIR] [-R RAKELIBDIR] [-T [PATTERN]] [-e CODE] [-p CODE] [-r MODULE] [--rules] [variable=value] target ... DESCRIPTION
Rake is a simple ruby(1) build program with capabilities similar to the regular make(1) command. Rake has the following features: o Rakefiles (Rake's version of Makefiles) are completely defined in standard Ruby syntax. No XML files to edit. No quirky Makefile syntax to worry about (is that a tab or a space?). o Users can specify tasks with prerequisites. o Rake supports rule patterns to synthesize implicit tasks. o Flexible FileLists that act like arrays but know about manipulating file names and paths. o A library of prepackaged tasks to make building rakefiles easier. OPTIONS
--version Display the program version. -C --classic-namespace Put Task and FileTask in the top level namespace -D [PATTERN] --describe [PATTERN] Describe the tasks (matching optional PATTERN), then exit. -E CODE --execute-continue CODE Execute some Ruby code, then continue with normal task processing. -G --no-system --nosystem Use standard project Rakefile search paths, ignore system wide rakefiles. -I LIBDIR --libdir LIBDIR Include LIBDIR in the search path for required modules. -N --no-search --nosearch Do not search parent directories for the Rakefile. -P --prereqs Display the tasks and dependencies, then exit. -R RAKELIBDIR --rakelib RAKELIBDIR --rakelibdir RAKELIBDIR Auto-import any .rake files in RAKELIBDIR. (default is rakelib ) -T [PATTERN] --tasks [PATTERN] Display the tasks (matching optional PATTERN) with descriptions, then exit. -e CODE --execute CODE Execute some Ruby code and exit. -f FILE --rakefile FILE Use FILE as the rakefile. -h --help Prints a summary of options. -g --system Using system wide (global) rakefiles (usually ~/.rake/*.rake ). -n --dry-run Do a dry run without executing actions. -p CODE --execute-print CODE Execute some Ruby code, print the result, then exit. -q --quiet Do not log messages to standard output. -r MODULE --require MODULE Require MODULE before executing rakefile. -s --silent Like --quiet, but also suppresses the 'in directory' announcement. -t --trace Turn on invoke/execute tracing, enable full backtrace. -v --verbose Log message to standard output (default). --rules Trace the rules resolution. SEE ALSO
ruby(1) make(1) http://rake.rubyforge.org/ REPORTING BUGS
Bugs, features requests and other issues can be logged at <http://onestepback.org/redmine/projects/show/rake>. You will need an account to before you can post issues. Register at <http://onestepback.org/redmine/account/register>. Or you can send an email to the author. AUTHOR
Rake is written by Jim Weirich <jim@weirichhouse.org> UNIX
November 7, 2012 UNIX
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