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Changing permissions
chown/chmod : Change the owner or group of a file
Relative Permissions
chmod [a,u,g,o][+,-][r,w,x] <filename>
[all, user, group, others] [add, remove] [read, write, execute]
Absolute Permissions
4 – read
2 – write
1 – execute
So, if we want to change a file's permissions to rwxr-xr-x , the command chmod 755 does the trick
Notes: