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chmod

Change the access permissions of a file or directory.

More information.

• Give the [u]ser who owns a file the right to e[x]ecute it:

chmod u+x {file}

• Give the [u]ser rights to [r]ead and [w]rite to a file/directory:

chmod u+rw {file_or_directory}

• Remove e[x]ecutable rights from the [g]roup:

chmod g-x {file}

• Give [a]ll users rights to [r]ead and e[x]ecute:

chmod a+rx {file}

• Give [o]thers (not in the file owner's group) the same rights as the [g]roup:

chmod o=g {file}

• Remove all rights from [o]thers:

chmod o= {file}

• Change permissions recursively giving [g]roup and [o]thers the ability to [w]rite:

chmod -R g+w,o+w {directory}

• Recursively give [a]ll users [r]ead permissions to files and e[X]ecute permissions to sub-directories within a directory:

chmod -R a+rX {directory}

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