A.ping
B.if config
C.race route
D.netstat
A.256
B.266
C.11
D.256×10
A.-rw-rw-rw- 2 hel-susers 56 Sep0911:05hello
B.-rwxrwxrwx 2 hel-susers 56 Sep0911:05goodbey
C.drwxr--r-- 1 helusers 1024 Sep1008:10zhang
D.lrwxr--r-- 1 helusers 2024 Sep1208:12cheng
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