chmod

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% ls -al
drwx--s--x 23 susaki  teacher   2048 Mar 12 16:21 .
drwxr-sr-x 18 root    daemon     512 Aug 30  2000 ..
-rw-------  1 susaki  teacher   1869 Jul 12  2000 .cshrc
-rw-------  1 susaki  teacher    175 Dec  3  2000 document.txt
-rw-------  1 susaki  teacher   1869 Nov 28  2000 image1.jpg
-rw-------  1 susaki  teacher    512 Jan  9 18:10 program

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-rw-------  1 susaki  teacher    175 Dec  3  2000 document.txt
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% chmod g+r document1.txt

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% chmod g-r document1.txt

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% chmod u+x process1.csh

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% chmod a+x process1.csh

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% chmod u+x process1.csh
% chmod g+x process1.csh
% chmod o+x process1.csh

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