Linux Common Commands

To view the number of connections

Netstat-nat|grep-i "|wc-l"

Half Open connection number

Netstat-an | awk '/^tcp/{++s[$NF]} END {for (a in S) print A, s[a]} '

Query Source IP Sort

Netstat-antp|grep Tcp|awk ' {print $ $} ' |grep-v ':: ' |cut-d:-f1|sort | uniq-c| Sort-nr|less

Netstat-antp|grep ' 8080 ' |awk ' {print $ ' |grep-v ':: ' |cut-d:-f1|sort | uniq-c| Sort-nr|less

SCP command

scp-p2222 a.tar.gz [Email protected]:/home/zwf/

scp-p2222 [email protected]:/home/zwf/xf.txt.

You can use the command to check the 5 processes with the most memory

PS aux | Sort-k4nr | Head-n 5

Or

Top (then press m, note uppercase)

You can use the command to check the 5 processes with the most CPU

PS aux | Sort-k3nr | Head-n 5

Or

Top (then press p, note capitalization)

Inquire

Netstat-nultp

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Linux Common Commands