ls |-show this list
|-ls -l show the more information
|- ls -a show a file which is hide
|-ls -h
pwd |-sh this files' path
cd |-inter a path or directory
touch |-open a file ,if it do not exist,it will be created
|- touch .s.txt means to creat hide a file,ls -a will show it
mkdir |-make directory
|-mkdir -p can creat /q/w/e/r/t/y,there are a lot files
rm |-delete a file
|- rm -f delete file,ignore which is not exist
|-rm -r delete the directory
rm -rf |-delete the directory
clear |-clean the screen
man command |-press the key space show another page
|-press the key enter get a line
|-press the key B ,back a page
|-press the key f ,get a new page
|-press the key Q,quit this page
command --help |- :express how to use the command
tab |-give the more conmand
|-if press twice tab,get the list to choose
cat |-watch a file
|-cat -b a.txt,will show a.txt with line-number
|-cat -n a.txt,will show a.txt with line-numberlist which for the airline
more |-show a file page to page
mv |-move a file to another directory,or rename it
cp |-copy a file
echo |-show it to screen
|-echo >> ,will add it to a file
|-ehco >,will replace it to a file
grep |-seacher it in a file
|-grep ^XX,means to seacher that which began with XX in a file
|-frep XX$,means to seacher thst which end with XX in a file
ifconfig |-show the network adapter information
chmod +/- r/w/x a.py|-give the power for file,+ means give,- means collect,r means read,w means write,x means excute,and excute should enter "./a.py"
date |-show system time
cal |-show system calendar
df |-show disk free,show the detail,df -h
du |-sh disk usage directory's file,show the detail du -h
ps aux |-sh the process,a means all of that,u means the detail,x means show the process which do not controled by the terminal
kill -9 XXX |-be force to kill the process with the XXX id
top |-list the process
find Desktop -name "*.py"|-find files that end with .py
|-if give no path,means find in now dirctory
ln -s XX XXX |-make a easy link for a file to open,soft link,we can open XXX to open XX
|-if no give the para ,it is hard link,delete the file,the hard link will not be deleted
tar -cvf file files |-make a lot files to be a big file
|-tar -cvfz file files ,will zip this file be a small file
tar -xvf file |-make a big file to be a lot files
|-tar -vxfz file,will release this file
gzip file |-zip a big file to be a small file,give the file ends with .tar.gz
bzip2 file |-zip a big file to be a small file,give the file ends with .tar.bz2
tar -jcvf file files |-zip
tar -jxvf file |-release the zip file
|-tar -jxvf file -C path ，point the release dirctory
apt |-sudo apt install XXX,means intall a application
|-sudo apt remove XXX,means uninstall
|-sudo apt upgrade XXX,means upgrade it
useradd -m -g usergroup_name user_name | -m built the home dirctory for the user
|-g point the user for a usergroup
passwd user_name |-give a password for the user
userdel -r |-delete the home dicrtory of a user
cat /etc/passwd | grep |-show a new user information
id user_name
who |-show the curtion login user list
whoami |-show the login user name
usermod -g group user |-change user's main group
usermod -G group user |-change user's group
chown user file |-change the own of a file or dictory
chgrp -R group file |-change the group for a file
chmod -R 755 file
install a software ,just release it;uninstall need to delete its' release files,and hoom/xxx file,and /usr/share/applications/xxxx
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