- when we see "#" that use is "root user"
- when we see "$" that use is "non root user"
non root user also perfrom like same root user if we provide
sudo -i --> swith root user
apt update --> to update Operating system
mkdir --> to creat directory
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vi filename.txt --> to create filename
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tail -n 2 filename.txt --> to print last two lines
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head -n 2 filename.txt --> to print "top" two lines
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ps -ef | grep ubuntu