man/man1/chmod.1

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NAME            chmod -- change mode
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SYNOPSIS        chmod\b\b\b\b\b_____ octal file\e91\e8 ...
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DESCRIPTION     The octal mode
replaces the mode of each of the files.
The mode is constructed from the OR of the
following modes:
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01 write for non-owner
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02 read for non-owner
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04 write for owner
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10 read for owner
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20 executable
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40 set-UID
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Only the owner of a file may change its mode.
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FILES           --
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SEE ALSO        stat(I), ls(I)
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DIAGNOSTICS     "?"
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BUGS            --