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Linux / Unix: Find Hidden Directories, Files and Folders

I'm a new Unix user and trying to find the hidden directory called .movies but I do not know where it is on the file system. How do I find a hidden folder or directories under Unix like operating systems?
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Ubuntu Linux: Add a User To Group

How do I add a user to group under Ubuntu Linux operating system using command line options?
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Debian Linux Install Truetype Fonts For Xorg

How do I install TrueType fonts under Debian GNU/Linux desktop operating systems?
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-bash: sudo: command not found Error and Solution

I'm typing the following command:

But, getting the error:

How do I fix this problem under Debian / Ubuntu / RHEL / CentOS Linux?
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Ubuntu Linux Stop a Process

How do I stop a process under Ubuntu Linux using command line and GUI tools?
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HowTo Install firefox-4.0.tar.bz2 in Linux

How do I install latest Firefox version 4.0 in Linux operating systems?
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Linux: HowTo See Directory Tree Structure

How do list contents of directories in a structure like format under Linux operating systems?
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resolvconf: Error: /etc/resolv.conf must be a symlink Error and Solution

When I try to restart my BIND 9 server under Ubuntu Linux using service bind9 restart or service bind9 start command, I get the following error:
resolvconf: Error: /etc/resolv.conf must be a symlink

How do I fix this problem?
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Linux / UNIX: Change Bash To KSH Shell

How do I change my current login shell from bash to ksh under Linux or UNIX or Apple OS X operating systems?
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HowTo: Reload (re-read) Partition Table In Ubuntu Linux

How do I reload the partition table in Ubuntu Linux without rebooting the systems?
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