Perl удаляет подстроку с $ впереди

sudo vim /etc/systemd/system/graphical. target.wants/Ktraffic.service

[Unit]
Description=Record net traffic

[Service]
Type=oneshot
ExecStart=/bin/bash   /etc/init.d/K01trafficLog.sh

[Install]
WantedBy=poweroff.target

sudo vim /etc/init.d/K011trafficLog.sh

#!/bin/bash
trafficlog="/var/log/traffic.log"
date "+%Y-%m-%d %H:%M:%S  "         >> $trafficlog
iptables  -v -L INPUT |grep Chain   >> $trafficlog

systemctl enable ktraffic.service