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chown command

How do I match dot files under Unix / Linux using bash shell? Why .* considered as harmful when matching dot files under bash shell?
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How do I install and configure SquidGuard - a web filter plugin for Squid to restrict access to domains/URLs based upon access control lists? How do I block porn, gambling, and other web-sites using squid proxy server version 3.x under Debian or Ubuntu Linux server for my school?
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When I try to login into my Linux Gnome based desktop system, I get the following error from GDM :

gconf-sanity-check-2 exited with status 256

How do I fix this problem?
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How do I set readonly permission for all files stored in /var/www/html directory?
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When I ssh into my server and login as t root user and I'm getting the following error on screen:

Could not chdir to home directory /root: No such file or directory

How do I fix this error under CentOS or Debian Linux server?
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How do I configure file system quotas to control how much available storage space can be used on a given UFS file system (such as /export/home) under Solaris UNIX operating systems?
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When I run the following command at mysql> I get an error which read as follows:

mysql> use dbname;
mysql> show tables;
ERROR 1018 (HY000): Can't read dir of './dbname/' (errno: 13)

How do I fix this problem under Debian Linux?
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