01-30-2011
Though I was taught from "day one" to use detailed Program Flowcharts and Decision Tables, in hindsight this was really just a teaching aid.
Btw. The only time I ever used Decision Tables in earnest was when programming in RPG.
I have use Program Flowcharts in earnest.
Once you can visualise a whole program module-by-module in your head you are a programmer and are unlikely to need detailed Program Flowcharts to produce working code. However a simple "main route" Flowchart should be documented as part of the program specification and maintained with the filed program documentation. This should include an introductary overview of the function of the program and the function of each main module without going into fine detail. This documentation should be verified by the System Analyst and a Senior Programmer before the program is allowed to "go live".
I you ever work on a site long-term this sort of documentation could save your life. Everybody expects you to remember every line of code you wrote in every program. For a while this is easy but once you reach the 100,000 lines mark you won't even remember the name of the System.
I have made much use of overview Flow Diagrams at a System and Network design level to show visually how the individual components fit together. I cannot stress how important Flow Diagrams are in a large scale commercial environment where is is quite possible to get a cold call to a fault where there is nobody to ask.
Footnote: Yes, I have spent two months retro-documenting a dubiously designed and sparsely documented System ready for the next (inevitable) obscure failure. Try to avoid this sort of situation folks!
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rmmod(8) System Manager's Manual rmmod(8)
NAME
rmmod -- simple program to remove a module from the Linux Kernel
SYNOPSIS
rmmod [-f] [-w] [-s] [-v] [modulename]
DESCRIPTION
rmmod is a trivial program to remove a module (when module unloading support is provided) from the kernel. Most users will want to use
modprobe(8) with the -r option instead.
OPTIONS
-v --verbose
Print messages about what the program is doing. Usually rmmod prints messages only if something goes wrong.
-f --force
This option can be extremely dangerous: it has no effect unless CONFIG_MODULE_FORCE_UNLOAD was set when the kernel was compiled.
With this option, you can remove modules which are being used, or which are not designed to be removed, or have been marked as
unsafe (see lsmod(8)).
-w --wait Normally, rmmod will refuse to unload modules which are in use. With this option, rmmod will isolate the module, and wait until
the module is no longer used. Nothing new will be able to use the module, but it's up to you to make sure the current users
eventually finish with it. See lsmod(8)) for information on usage counts.
-s --syslog
Send errors to syslog instead of standard error.
-V --version
Show version of program and exit.
COPYRIGHT
This manual page originally Copyright 2002, Rusty Russell, IBM Corporation. Maintained by Jon Masters and others.
SEE ALSO
modprobe(8), insmod(8), lsmod(8) modinfo(8)
rmmod(8)