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Ctrl+Alt+T 
exit 
halt 
halt -d 
halt -p 
reboot 
shutdown -r now 
shutdown -h now  
shutdown -r +10 
shutdown -r 10:00 
shutdown -h +10 
shutdown -h 10:00 
Ctrl+Alt+F2 
Ctrl+Alt+F7 

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pwd 

cd 目录名 
cd / 
cd ..
cd ~/demo 

mkdir 目录名 

rmdir 目录名 

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ls 
ls -a  
ls -l 
ls -al 

tree 

cp file1 file2 
cp -r dir1 dir 2 

touch 

rm 
rm -r 目录名 
rm -ir 目录名 

mv file1 file2 
mv file1 dir2 

find -name demo.c 
find -name "hi*" 
find -name ".c" 
find -size -10c 
find -size +20c 
find -type d 
find -mtime -5 
find -atime -6 
find -name "*.c" -exec ls -l {} \; 

tar zcvf a.tar.gz b.txt c.txt 
tar jcvf a.tar.gz b.txt c.txt 
rar a aa b.txt c.txt 
rar x aa.rar 
rar x aa.rar desc

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clear 

date 
cal 
cal [ [ moth ] year ]  

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sudo apt install gcc  
sudo apt install build-essential  
gcc --version  

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