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Master Boot Record (MBR) Fix and Repair on Pre-XP Systems

This fdisk command will allow you to recreate the Master Boot Record or MBR on systems running WIndows prior to XP. Although this can be dangerous, it is a quick way to fix many boot issues.

Disable ICMP echo (ping) responses in Linux

Many malicious attacks begin with a ping scan. Disabling ICMP echo requests prevents your system’s discovery with a ping.

Continuously Watch a Text File in UNIX

Using the tail command with an option, the file will remain open and you will see any additional output written to the file. This is especially useful for watching log files.

Register dll or ocx

Instructions for manually registering a dll or ocx file on a Windows system.

SystemInfo is a powerful tool for displaying information about a system

This command will show information such as the registered owner, product ID, install date, memory, domain name, server, and installed hotfix patches. The systeminfo command is found in xp, vista, and windows 7 installations.

Power off a Solaris system

This command will safely turn off a Solaris system using the init command.

Find all empty files in a UNIX filesystem

Using the find command, this locates all files with zero length.

Limit the depth of search using find

The find command searches all subdirectories under the specified path by default. Using the maxdepth option, the search depth can be limited.

Find UNIX files with no valid owner

Using the find command, one can locate files that are owned by a uid that no longer exists.

Check the UNIX passwd file for errors

Errors in the /etc/passwd file can cause many problems including the inability to login as root. The pwck command is a quick way to test the file and should be run whenever you make manual edits.

Check the UNIX group database for errors

UNIX systems store user group information in the /etc/group file. Errors in this file can cause a variety of problems.

Create a Virtual Interface in Solaris

Virtual interfaces allow a single ethernet interface to listen on additional IP addresses.

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