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Full Discussion: Conditional delete
Top Forums Shell Programming and Scripting Conditional delete Post 303022261 by Don Cragun on Wednesday 29th of August 2018 01:26:18 AM
Old 08-29-2018
I would be tempted to try a slightly simpler pipeline for what RudiC suggested:
Code:
ls -1 2[0-9][0-9][0-9][01][0-9][0-3][0-9]_[0-2][0-9][0-5][0-9].tar.gz |
awk -F_ '
$1 == last {
	print "echo rm " file
	file = $0
	next
}
{	last = $1
	file = $0
}' | sh

If the above prints a list of the rm commands you want to run, remove the echo from the script and run it again.

Note that you should also tell us what operating system and shell you're using when you start a thread in the Shell Programming and Scripting forum so we don't suggest things that can't work in your environment. If you are using a Solaris/SunOS system, change awk in the above script to /usr/xpg4/bin/awk or nawk.

If I create the files you named in post #1 in a directory and run the above script in that same directory, the output produced is:
Code:
rm 20180720_1812.tar.gz
rm 20180720_1912.tar.gz
rm 20180720_2012.tar.gz
rm 20180721_0012.tar.gz
rm 20180721_0112.tar.gz
rm 20180721_0212.tar.gz

On most systems you can omit the -1 option (that is the digit one; not the letter ell), but on some old systems the ls utility doesn't produce one name per line of output when output is directed to a pipe (as required by the standards).

Obviously, you can add a df on your source filesystem and check for the desired level of free space before or after each file is deleted or each time the date changes. Since your requirements aren't clear as to when this testing should be performed, I'll leave that as an exercise for the reader. (The output format produced by df also varies somewhat depending on what options you use and what operating system you're using. And, I'm not going to try to guess what OS you're using.)
This User Gave Thanks to Don Cragun For This Post:
onenessboy
 

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LEARN ABOUT SUSE

virt-tar-in

virt-tar-in(1)						      Virtualization Support						    virt-tar-in(1)

NAME

       virt-tar-in - Unpack a tarball into a virtual machine disk image.

SYNOPSIS

	virt-tar-in -a disk.img data.tar /destination

	virt-tar-in -d domain data.tar /destination

	zcat data.tar.gz | virt-tar-in -d domain - /destination

WARNING

       Using "virt-tar-in" on live virtual machines can be dangerous, potentially causing disk corruption.  The virtual machine must be shut down
       before you use this command.

DESCRIPTION

       "virt-tar-in" unpacks an uncompressed tarball into a virtual machine disk image or named libvirt domain.

       The first parameter is the tar file.  Use "-" to read the tar file from standard input.	The second parameter is the absolute target
       directory to unpack into.

EXAMPLES

       Upload a home directory to a guest:

	virt-tar-in -d MyGuest homes.tar /home

JUST A SHELL SCRIPT WRAPPER AROUND GUESTFISH

       This command is just a simple shell script wrapper around the guestfish(1) "tar-in" command.  For anything more complex than a trivial
       copy, you are probably better off using guestfish directly.

OPTIONS

       Since the shell script just passes options straight to guestfish, read guestfish(1) to see the full list of options.

SEE ALSO

       guestfish(1), virt-cat(1), virt-copy-in(1), virt-copy-out(1), virt-edit(1), virt-make-fs(1), virt-tar-out(1), <http://libguestfs.org/>.

AUTHORS

       Richard W.M. Jones ("rjones at redhat dot com")

COPYRIGHT

       Copyright (C) 2011 Red Hat Inc.	<http://libguestfs.org/>

       This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
       the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

       This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation,
       Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

libguestfs-1.18.1						    2013-12-07							    virt-tar-in(1)
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