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Full Discussion: Help with rotating files
Top Forums Shell Programming and Scripting Help with rotating files Post 303040839 by Cacializ on Thursday 7th of November 2019 01:40:39 PM
Old 11-07-2019
Help with rotating files
Hello:
I have a script that gets the ACLs of the /home directory and its contents with getfacl and writes them to a file. The script is run by a cron job and I don't want it to rewrite or append to an already existing file. The point of backing permissions up is because I may need to restore them. But I don't want to store every single created file either.

The files don't need to have a specific naming convention. In fact, I took advantage of this: I decided to name the files after the date they were created:
Code:
#!/bin/sh
readonly file="$(date +'%Y-%m-%d')"
getfacl -pR /home > "/var/acl_backups/$file"

This has the advantage that the most recent files are alphabetically greater than older ones, so I thought of putting them in the positional parameters and delete the one I didn't want to preserve. For example, if I wanted to have a maximum of 7 files in the /var/acl_backups directory:
Code:
#!/bin/sh
LC_COLLATE=C set -- [[:digit:]][[:digit:]][[:digit:]][[:digit:]]-[[:digit:]][[:digit:]]-[[:digit:]][[:digit:]]
if [ $# -ge 7 ]
then
    rm -- "$7"
fi

readonly file="$(date +'%Y-%m-%d')"
getfacl -pR /home > "/var/acl_backups/$file"

Changing the locale of LC_COLLATE may be unnecessary, but I decided to change it just to be sure it sorts numbers from 0 to 9.

My question is: is this a reliable way to rotate files? I thought of using logrotate was well, but as far as I know, it would mean that every file would have the same name except for a number at the end. If I ever need to restore them with setfacl having the date in their names is very convenient.

Thanks in advance.
Last edited by Cacializ; 11-07-2019 at 02:57 PM..
 

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LEARN ABOUT DEBIAN

apticron

apticron(1)						      General Commands Manual						       apticron(1)

NAME

       apticron - Generate a mail listing packages which are pending an upgrade

SYNOPSIS

       apticron [--cron]

DESCRIPTION

       apticron is a shell script which generates a mail with a list of all packages currently pending an upgrade, as well as summary of changes -
       using apt-listchanges - to a configurable Email address.

       apticron is mainly intended for automatic notification of pending security updates but can also be used	in  many  other  situations  where
       timely updates are necessary.

       The --cron option is only meant to be used when invoked by cron in order to run no more than once a day.

FILES

       /etc/apticron/apticron.conf
	      Configuration file, Email address to mail and profile for use with apt-listchanges are configurable.

       /etc/cron.d/apticron
	      Cron job for executing apticron daily.

       /etc/cron.daily/apticron
	      Fallback cron script for executing apticron (if no crond running or system down at designated time).

       /var/lib/misc/apticron.cron
	      Time stamp file used by apticron when invoked with --cron option.

SEE ALSO

       apt-get(8), apt-listchanges(1), cron(8)

AUTHOR

       Apticron  was initially developed by Colm MacCarthaigh <colm.maccarthaigh@heanet.ie> with contributions from Marc Sherman <msherman@projec-
       tile.ca>. Since 2006 it is maintained and improved by Tiago Bortoletto Vaz <tiago@debian.org>.

																       apticron(1)
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