Change directory:

chnage to home of the logged in user

cd ~

Change to previous directory

cd -

To re-enter a command entered previously

!starting-letters of the command

eg:

!netstat

To list listening ports and PID:

netstat -nlp

Eg:

To list all ruby ports:

netstat -nlp | grep ruby

for tomcat n all

netstat -nlp | grep java

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