使用systemd服务在每次启动时禁用WiFi
在Ubuntu 16.04上，我不喜欢在操作系统启动时自动启用WiFi。 灵感来自默认情况下如何关闭无线网卡的无线电？ ，我写了一个silentWiFi.service作为
[Unit] Description=Disable Wi-Fi on startup Before=NetworkManager.service [Service] Type=oneshot ExecStart=/etc/default/silenceWiFi [Install] WantedBy=multi-user.target 用/ etc / default / silenceWiFi只有以下简单的行
#!/bin/sh /bin/sed -i -re "s/^(WirelessEnabled=).*\$/\1false/" /var/lib/NetworkManager/NetworkManager.state
它按预期工作。
但是，如果我在silentWiFi.service中更改ExecStart行
ExecStart=/bin/sed -i -re '\"s/^(WirelessEnabled=).*\\$/\\1false/\"' /var/lib/NetworkManager/NetworkManager.state
服务总是有错误
sudo systemctl status silenceWiFi.service
将产生以下消息
● silenceWiFi.service - Disable Wi-Fi on startup Loaded: loaded (/lib/systemd/system/silenceWiFi.service; enabled; vendor preset: enabled) Active: failed (Result: exit-code) since Fri 2016-08-26 16:10:46 CST; 10s ago Process: 20423 ExecStart=/bin/sed -i -re "s/^(WirelessEnabled=).*\$/\1false/" /var/lib/NetworkManager/NetworkManager.state (code=exited, Main PID: 20423 (code=exited, status=1/FAILURE) Aug 26 16:10:46 Y12 systemd[1]: Starting Disable Wi-Fi on startup... Aug 26 16:10:46 Y12 sed[20423]: /bin/sed: -e expression #1, char 1: unknown command: `"' Aug 26 16:10:46 Y12 systemd[1]: silenceWiFi.service: Main process exited, code=exited, status=1/FAILURE Aug 26 16:10:46 Y12 systemd[1]: Failed to start Disable Wi-Fi on startup. Aug 26 16:10:46 Y12 systemd[1]: silenceWiFi.service: Unit entered failed state. Aug 26 16:10:46 Y12 systemd[1]: silenceWiFi.service: Failed with result 'exit-code'.
是否可以将sed放在ExecStart行中，该行无需shell脚本（例如，没有/ etc / default / silenceWiFi的帮助）。
是的，只需使用以下行
ExecStart=/bin/sed s/^WirelessEnabled=true/WirelessEnabled=false/ -i /var/lib/NetworkManager/NetworkManager.state
相反，在“现代”解决方案中使用cmd行，systemd不再抱怨了。
sudo systemctl status silenceWiFi.service
你会看见
● silenceWiFi.service - Disable Wi-Fi on startup Loaded: loaded (/lib/systemd/system/silenceWiFi.service; enabled; vendor preset: enabled) Active: inactive (dead) since Fri 2016-08-26 17:29:12 CST; 4min 31s ago Process: 2506 ExecStart=/bin/sed s/^WirelessEnabled=true/WirelessEnabled=false/ -i /var/lib/NetworkManager/NetworkManager.state (code=ex Main PID: 2506 (code=exited, status=0/SUCCESS) Aug 26 17:29:12 Y12 systemd[1]: Starting Disable Wi-Fi on startup... Aug 26 17:29:12 Y12 systemd[1]: Started Disable Wi-Fi on startup.