@a user register into the group
#/usr/sbin/usermod -g groupname username
$ /usr/sbin/usermod -g hadoop hadoop
@Find files to include strings
find . -exec grep -l "Contents of directory" {} \; 2>/dev/null
@Find files
find . -name "*Status*" -print
@Make ssh keys
ssh-keygen -t dsa -> Make a dsa
ssh-keygen -t rsa -> Make a rsa
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