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Top Forums Shell Programming and Scripting Urgent ...pls Sorting files based on timestamp and picking the latest file Post 302642071 by robertbrown624 on Thursday 17th of May 2012 01:36:18 AM
Old 05-17-2012
Data Urgent ...pls Sorting files based on timestamp and picking the latest file

Hi Friends,

Newbie to shell scripting. Currently i have used the below to sort data based on filenames and datestamp
Code:
$ printf '%s\n' *.dat* | sort -t. -k3,4
filename_1.dat.20120430.Z
filename_2.dat.20120430.Z
filename_3.dat.20120430.Z
filename_1.dat.20120501.Z
filename_2.dat.20120501.Z
filename_3.dat.20120501.Z
filename_1.dat.20120502.Z
filename_2.dat.20120502.Z
filename_3.dat.20120502.Z
filename_1.dat.20120627.Z
filename_2.dat.20120627.Z
filename_3.dat.20120627.Z
filename_1.dat.20120730.Z
filename_2.dat.20120730.Z
filename_3.dat.20120730.Z

Now i want to delete files with older date and keep 4 latest files available in the filename(no system timestamp here) So my result should be like
Code:
filename_1.dat.20120501.Z
filename_2.dat.20120501.Z
filename_3.dat.20120501.Z
filename_1.dat.20120502.Z
filename_2.dat.20120502.Z
filename_3.dat.20120502.Z
filename_1.dat.20120627.Z
filename_2.dat.20120627.Z
filename_3.dat.20120627.Z
filename_1.dat.20120730.Z
filename_2.dat.20120730.Z
filename_3.dat.20120730.Z


Last edited by fpmurphy; 05-18-2012 at 05:49 AM..
 

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ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
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