curr_perc = $5; sub("%$", "", curr_perc);
prev_perc_file = ENVIRON["HOME"] "/var/run/status/disk_space_used";
getline prev_perc < prev_perc_file;
curr_perc = $5; sub("%$", "", curr_perc);
prev_perc_file = ENVIRON["HOME"] "/var/run/status/disk_space_used";
getline prev_perc < prev_perc_file;