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rewrite with pkg managers plugins like

Merged Hahn Axel (hahn) requested to merge 5419-update-check-packages2install into master
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#!/bin/bash
# ===============================================================
#
# PACKAGE MANAGER: APT
# Debian, Ubuntu
#
# included by ../check_packages2install
#
# ---------------------------------------------------------------
# ah <axel.hahn@iml.unibe.ch>
# 2022-06-03 v1.0 ah first version
# ===============================================================
# ---------------------------------------------------------------
# command to list of updates
function aptGetUpdates(){
sudo apt-get -u upgrade --assume-no
}
# ---------------------------------------------------------------
# extract list of packages 2 install
# global string packagemanOut output of update lister command
function aptPackages(){
# detect number of line containing "The following packages will be upgraded:"
typeset -i local iStart
iStart=$( echo "$packagemanOut" | grep -n '^The following packages will be upgraded:' | cut -f 1 -d ':' )
if [ $iStart -eq 0 ]; then
echo "Nothing to install"
else
# show packages = text starting with 2 spaces below start line
# packages are delimited with space -> replace with new line
echo "$packagemanOut" | sed -n $iStart,\$p | grep "^\ \ " | sed "s#^\ \ ##g" | tr " " "\n"
fi
}
# ---------------------------------------------------------------
# get status line on apt based systems (debian, ubuntu)
# global string packagemanOut output of update lister command
function aptStatus(){
echo "$packagemanOut" | grep "upgraded.*installed"
}
# ---------------------------------------------------------------
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