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chmod o-rwx foldername To change directory permissions for everyone, use “u” for users, “g” for group, “o” for others, and “ugo” or “a” (for all). chmod ugo+rwx foldername to give read, write, and execute to everyone. chmod a=r foldername to give only read permission for everyone.
Setting 777 permissions to a file or directory means that it will be readable, writable and executable by all users and may pose a huge security risk.
To modify the permission flags on existing files and directories, use the chmod command ("change mode"). It can be used for individual files or it can be run recursively with the -R option to change permissions for all of the subdirectories and files within a directory.
chmod 666 file/folder means that all users can read and write but cannot execute the file/folder; chmod 777 file/folder allows all actions for all users; chmod 744 file/folder allows only user (owner) to do all actions; group and other users are allowed only to read.
man 3 chmod contains the information you are looking for.
chmod -R +r directory
the -R option tells chmod to operate recursively.
As a directory could contain links and/or bind mounts, the use of find could ensure a finest granularity in what to do and what to not do....
find directory \( -type f -o -type d \) -print0 |
xargs -0 chmod ugo+r
To exclude paths under mount points:
find directory -mount \( -type f -o -type d \) -print0 |
xargs -0 chmod ugo+r
To exclude some specific files (.htaccess for sample):
find directory \( -type f -o -type d \) ! -name '.htaccess' -print0 |
xargs -0 chmod ugo+r
chmod -R 0444 ./folder_name
Apply the permission to all the files under a directory recursively
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