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Debian Linux Install Eclipse Java / C / C++ IDE

How do I install Java and C/C++ integrated development environment called Eclipse under Debian GNU/Linux squeeze v6.xx?
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I would like to use argparse module for Python 2.6 under Debian Linux. However, the code is not working. How do I install and use argparse Python module under Debian Linux 6.x for Python version 2.5 or 2.6?
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I have recently started to managing FreeBSD server along with Ubuntu Linux. However, sudo command, always shows me the following error:

zsh: command not found: sudo

How do I solve this problem and use sudo under FreeBSD 9.x system?
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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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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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