raspiBackup_mem_pre.sh

#!/bin/bash
#######################################################################################################################
#
# Sample plugin for raspiBackup.sh
# called before a backup is started
#
# Function: Display memory free and used in MB
#
# See http://www.linux-tips-and-tricks.de/raspiBackup for additional information
#
#######################################################################################################################
#
#    Copyright (c) 2015-2021 framp at linux-tips-and-tricks dot de
#
#    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 3 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, see <http://www.gnu.org/licenses/>.#
#
#######################################################################################################################

GIT_DATE="$Date$"
GIT_COMMIT="$Sha1$"

# define functions needed
# use local for all variables used so the script namespace is not poluted

#              total        used        free      shared  buff/cache   available
#Mem:            481          55          34           8         391         353
#Swap:            99          83          16

function getMemoryFree() {
	eval set -- "$(LC_ALL=C free -m |grep -i 'Mem:')"	# "Mem" will be "Speicher" in German and others in other languages, so force language to be English
	echo "$3 $4"
}

ext_freememory_pre=( $(getMemoryFree) )
# set any variables and prefix all names with ext_ and some unique prefix to use a different namespace than the script