chmod: chmod - change file mode bits

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Binary
File(s) or dir(s)
Change files and directories recursively
Permission for file(s) owner	r w x X s t
Permission for file(s) group	r w x s
Permission for other	r w x X
Permission for all (owner,group,other)	r w x X
Use this file mode instead of MODE values
Output a diagnostic for every file processed
Output a diagnostic for file only when a change is made
Suppress most error messages
Display help and exit
Output version information and exit