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Linux Tutorial Topics: 

Note that any given object can relate to more than one topic, so it is likely that pages will appear more than once. For example, concepts may relate to topics that are slightly different from the topic of the page where they are discussed in detail.

Troubleshooting

Pages

Working with the System -> When Things Go Wrong
Basic Administration -> System Logging -> Syslogd
Basic Administration -> System Logging -> Managing System Logs
Basic Administration -> Backups -> Backups
Basic Administration -> System Logging -> System Logging
The Computer Itself -> Video Cards and Monitors -> Video Card Common Problems
The Computer Itself -> HW Diagnostics -> HW Diagnostics
Networking -> NFS -> When Things Go Wrong
System Monitoring -> Finding Out About Your System -> Finding Out About Your System
System Monitoring -> Finding Out About Your System -> Hardware and the Kernel
System Monitoring -> Finding Out About Your System -> Terminals
System Monitoring -> Finding Out About Your System -> Hard Disks and File Systems
System Monitoring -> Finding Out About Your System -> User Files
System Monitoring -> Finding Out About Your System -> Network Files
System Monitoring -> Finding Out About Your System -> Important System Files
System Monitoring -> What the System Is Doing Now -> Users
System Monitoring -> What the System Is Doing Now -> Processes
System Monitoring -> What the System Is Doing Now -> Files and File Systems
System Monitoring -> What the System Is Doing Now -> Checking Other Things
System Monitoring -> Big Brother -> Big Brother
Solving Problems -> Solving Problems
Solving Problems -> Solving Problems Yourself -> Solving Problems Yourself
Solving Problems -> Solving Problems Yourself -> Preparing Yourself
Solving Problems -> Solving Problems Yourself -> Checking the Sanity of Your System
Solving Problems -> Solving Problems Yourself -> Problem Solving
Solving Problems -> Solving Problems Yourself -> Crash Recovery
Solving Problems -> Solving Problems Yourself -> Hardware Diagnostic Tools
Solving Problems -> Getting Help -> Calling Support
Solving Problems -> Getting Help -> Consultants
Solving Problems -> Getting Help -> Other Sources
Installing and Upgrading -> Preparing for the Installation -> Preparing for the Worst
Solving Problems -> Getting Help -> Getting Help
System Monitoring -> What the System Is Doing Now -> What the System Is Doing Now
The Operating System -> Files and File Systems -> File System Tools

Concepts

A "connection refused" when trying to access a remote machine may indicate that the service is not configured in /etc/inetd.conf.
A "connection refused" when trying to access a remote machine may indicate that the wrong program is started from /etc/inetd.conf.
A common reason commands are not found is that they are not in your path
The system-wide default evironment is defined in /etc/profile.
Messages can be sent to the system logger daemon on other machines.
You can watch the output of a program using the watch command.
You can search for files based on their age using the -mtime,-atime, and -ctime options to the find command.
The /proc filesystem contains a great deal of information about your running system.
The 'file' command is used to determine a file's type or contents (i.e. binary, shell-script, ASCII).
The /etc/magic file contains information used to determine a file's type or contents. (i.e. binary, shell-script, ASCII)
Errors encountered as the system boots can be found in /var/log/messages.
The system logging daemon is syslogd.
The configuration file for the init program is stored in the file /etc/inittab.
The 'nice' command can be used to change a process' priority.
The 'renice' command can be used to the priority of a running process.
So-called "well-known ports" are listed in the file "/etc/services".
If DNS is not used, host to IP address mapping is done through the /etc/hosts file.
A device which works with one Linux distribution, may not necessary work with others. (Although it usually does)
The 'rpcinfo' utility can be used if you want see all the programs using RPC on a specific machine.
System messages can be sent to the system logger daemon on other machines.
Because a device driver needs to be sure that it has properly completed its task, it usually cannot quit until it has finished.
Not all IP addresses are available on the Internet.

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