chmod -R +X /dir applies execution to folders only

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chmod -R +X /dir applies execution to folders only

the capital X means: set the executable bit only if the target a) is a directory b) has already at least one executable bit set for any one of user, group, others.

 alternative:
chmod -R g=u /var/somedirectory
This will give any file the group permissions identical to the user's permission.

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