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linux operating systems

Linux View Process Address Space

How do I view process address space under Linux operating systems?
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HowTo: Revoke OpenSSH Keys and Disable User Access

Many users are using ssh to log into a remote machine and append the indicated identity file to machine's ~/.ssh/authorized_keys file. I recently moved one of my server, and I would like to revoke openssh keys and disable user access under Linux operating systems. How do I revoke OpenSSH keys under Unix or Linux operating systems?
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HowTo: Linux Show List Of Network Cards

How do I display a list of all network cards under Linux operating systems?
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How do I install nmon command under Linux operating systems to find out performance information for my CPU, memory, network, disk, virtual memory, top process and other part of my HP server running on Debian Linux or CentOS Linux 6.x amd64 bit server?
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How do I find out what the name of my CD-ROM or DVD device or Blu-ray device is under Linux operating system without using GUI options?
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Linux Find And Report On File Fragmentation

How do I find out badly fragmented a particular file might be under Linux operating systems?
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I'm trying to use Cinelerra video editing and compositing software under Linux operating systems. However, I'm getting the following error:

MWindow::init_shm: /proc/sys/kernel/shmmax is 0x1000000.
It should be at least 0x7ffffff for cinelerra.

How do I fix this problem?
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