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ShellµÄÀàÐÍ:ashbashkshcshtcsh
--/etc/shells
--echo $SHELL
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ÎļþºÍĿ¼µÄȨÏÞ(-rwxr--r--)
setuid(suid/guid)(chmod u+s,g+s file)
umask(umask nnn)
·ûºÅÁ´½Ó(ln [-s] source_path target_path)
chmod [who] operator [permission] filename
who(u,g,o,a)
operator(+,-,=)
permission(r,w,x,s,t)
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#chmod u+s myfile
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#chmod u+t myfile
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#ls -l /bin | grep '^...s'
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chmod mode filename
mode
-r --4
-w --2
-x --1
chmod 664 myfile
chmod 740 myfile
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#chmod 4744 myfile
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chownºÍchgrp
chown [-R] owner myfile //±íʾÕû¸öĿ¼µÄÓµÓÐÕß¶¼¸Ä±ä¡£
chown owner.group myfile //±íʾӵÓÐÕߺÍ×é¶¼¸Ä±ä¡£
chown.group myfile
chgrp [-R] group myfile
umask
/etc/profile($HOME/.profile
$HOME/.bash_profile)
umask
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#umask
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