shell

man

to find help! (manul pages) like ：man man

pwd

pwd print working directory

ls

ls lists

ls -a can expose those .name type hidden files

ls-l in long format

ls-t by the time they were last modified

cd

cd change directory

cd ..

Cd .. back up to the parent directory

cd -

cd - go back to the previous directory

cd ~

cd ~ home directory of the use

clear / cmd+K

clear the screen

open

open

./

execute file

touch

creat a new file

rm

rm stands for remove

• rm -r remove a directory

cp

copy files

mv

move and rename file

tab

autocomplete what you type

sudo

do as sue, do the following things as a superuser

sudo su get you a shell as super user

nano

edit (nano is an editor which is simpler than Vim)

⬆︎⬇︎

go through the previous lines

history

to see the history

mkdir

mkdir make directory

cat

The cat command outputs the contents of a file to the terminal. When you type cat hello. txt, the

contents of hello.txt are displayed.

tail

tail prints the last end line of its input

lsof

lsof is a command meaning "list open files", which is used in many Unix-like systems to report a list of all open files and the processes that opened them.

• lsof -i tcp:port : show info of this port

for example:

~ lsof -i tcp:8080
COMMAND   PID USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
java    95423   re  125u  IPv6 0x531851168af9827b      0t0  TCP *:http-alt (LISTEN)