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- $ ls -l /sys/class/net/wlan7/speed
- -r--r--r-- 1 root root 4096 3月 24 15:08 /sys/class/net/wlan7/speed
- $ sudo cat /sys/class/net/wlan7/speed
- [sudo] password for xieerqi:
- cat: /sys/class/net/wlan7/speed: Invalid argument
- read(3, 0x7f6ad6b44000, 131072) = -1 EINVAL (Invalid argument)
- write(2, "cat: ", 5cat: ) = 5
- write(2, "/sys/class/net/wlan7/speed", 26/sys/class/net/wlan7/speed) = 26
- open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 4
- $ cat /sys/class/net/eth3/speed
- 10
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