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Linux Optimize Directories ( File Access Time ) in ext3 Filesystem

Q. I'm using CentOS Linux 5 server with ext3 on /disk2 (/dev/sdb1). How do I improve my file server performance. I've many large files in directories and how do I speed up access time?
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Find Files By Access, Modification Date / Time Under Linux or UNIX

I do not remember where I saved pdf and text files under Linux. I have downloaded files from the Internet a few months ago. How do I find my pdf or text files?
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Linux Check Memory Usage

How do I check used and free RAM memory usage under Linux operating systems using command line and GUI tools?
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Commonly used UNIX / Linux commands by new user

Q. . I'm a new Linux user. Can you tell me commonly used Linux / UNIX command?
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