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How To Write First UNIX Korn Shell Script Program

Can you tell me how to write a UNIX korn shell script program? I'm new to UNIX scripting and HP-UX UNIX operating system.
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Find Linux / UNIX Kernel Version Command

How do I find out what kernel version I am currently running under Debian Linux or any other Linux distribution using a shell prompt? How do I find out Unix kernel version?
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How do I compare the HP-UX UNIX system output with the most current vendor recommended and security patches?
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Linux Rescan HP Smart Array For New Disks

How do I rescan an HP Smart Array for new disks without rebooting in CentOS or Debian or RHEL server?
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Q. After re-installing my HP server system, RHN is not working. How do I re-register my system with Red Hat Network (RHN) again?
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Q. How can I apply package updates from Red Hat Network (RHN) for my HP Red Hat Enterprise Linux Server?
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Q. I am using Linux on HP server and I am getting error that read as follows:
Linux Kernel panic: VFS: Unable to mount root fs

How do I solve this problem?

A. Most modern distributions including Debian uses loadable kernel module for ext3 file system. So to read ext3/ext2 file system kernel must load ext3 kernel module (ext3.ko).

This module is included in an initrd image. If an initrd image is missing or that image does not include suitable kernel modules to access the ext3 filesystem on the partition, an error message (Linux Kernel panic: VFS: Unable to mount root fs) will be displayed to you.

To solve this problem you need to use mkinitrd script that constructs a directory structure that can serve as an initrd root file system.

The instructions for creating initrd images are here on our site.