changing special mods using chmod

[Guest alireza_fatahi]

hi every one. first post :)

so I've been looking how to change special mods (uid/gid/sticky) with chmod command. i found out how to do that with numbers like this chmod 2755 file .

but what i'm asking is how to change with characters.

you know, like this chmod -R u+w,go-w docs

thanks in advance, new to unix :)

 

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