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4.6 Usage messages, syntax- and general error messages
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<P>
Each program carries a usage message. If you enter the program
name without any arguments, the program will write the complete
usage message to standard error (your screen, unless you
redirect it). This message explains in detail what all the
valid arguments are. If you enter the program name followed
by a <I>hyphen</I> (-) only you will get a shorter version
which only shows the command line syntax and no detailed
explanations. If you incorrectly specify an option or omit
a required option, the program will produce syntax errors and
explain what the correct syntax for these options should be.
If an error occurs during the running of a program, the
program will in some cases recognize this and give you an
error message. Usually this will also terminate the run.
The error messages generally begin with the name of the
program in which the error occurred; if you have several
programs piped together this tells you where the trouble is.
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<ADDRESS>
Paul Wessel
2001-04-18
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