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chmod(1) - Unix First Edition Manual Page
11/3/71CHMOD (I)

NAME chmod -- change mode
SYNOPSIS chmod octal file
DESCRIPTION The octal mode replaces the mode of each of the files. Themode is constructed from the OR of the following modes:

01 write for non--owner02 read for non--owner 04 write for owner10 read for owner 20 executable40 set--UID

Only the owner of a file may change its mode.
SEE_ALSO stat, ls
OWNER ken, dmr