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Users and Permissions in Linux

touch file.txt
ls -l file.txt
chmod g+w file.txt # add write permission to group
ls -l file.txt
chmod a+w file.txt # add write permission to all users
ls -l file.txt
chmod a-w file.txt # remove write permission from all users
ls -l file.txt
chown guest file.txt
ls -l file.txt
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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