mabox-tools/bin/mb-setvar

#!/bin/bash
#    mb-setvar: utility to set/change config variables
#    Copyright (C) 2020 napcok <napcok@gmail.com>


if [[ $# < 1 ]]; then
    self=$(basename $0)
    echo "Usage: $self variable=value [/PATH/TO/CONFIG_FILE]"
    echo "Current configuration:"
    cat $HOME/.config/mabox/mabox.conf
    exit 2
fi
if [[ $1 != *"="* ]]; then
    self=$(basename $0)
    echo "$self: First argument must be variable=value"
    exit 2
fi

FILE=${2:-$HOME/.config/mabox/mabox.conf}
#echo $1
search=$(echo $1|cut -d= -f1)
if [[ $search =~ "bottom_img" ]]; then
sed -i /^"$search="/d $FILE
fi
if grep -Rq $search $FILE
then #found
   sed -i s/^"$search=".*$/"$1"/ $FILE
else #not found
   echo $1 >> $FILE
fi