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Mar 26th, 2017
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  1. $ ls -l /sys/class/net/wlan7/speed
  2. -r--r--r-- 1 root root 4096 3月 24 15:08 /sys/class/net/wlan7/speed
  3.  
  4. $ sudo cat /sys/class/net/wlan7/speed
  5. [sudo] password for xieerqi:
  6. cat: /sys/class/net/wlan7/speed: Invalid argument
  7.  
  8. read(3, 0x7f6ad6b44000, 131072) = -1 EINVAL (Invalid argument)
  9. write(2, "cat: ", 5cat: ) = 5
  10. write(2, "/sys/class/net/wlan7/speed", 26/sys/class/net/wlan7/speed) = 26
  11. open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 4
  12.  
  13. $ cat /sys/class/net/eth3/speed
  14. 10
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