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"chmod"

This command is used to change the permissions of a file or directory.
For example to make a file "testplan" readable by everyone, we do this:
% chmod a+r testplan
To make a file "testplan" to be executable, we do this :
% chmod +x mycommand
Now we can run mycommand as a command. To check the permissions of a file use ls -

For more details "chmod" command please type "man chmod"

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