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Chapters:
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<h3>9.3.1: `<font color="#82140F"><code>assert</code></font>'</h3>
<!-- latex: \index{assert} -->
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<PRE>
<font color="#82140F">
`assert .condition. ["message"]
</font></PRE>
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<p>
The condition may be a variable, a synonym, or an RPN expression. If
this condition is true (i.e. evaluates to a non-zero number), do
nothing. If the condition is false, the program will terminate with an
error condition (in unix, it will terminate with a non-zero exit code).
<p>
Before termination, a message will be printed, the form of which depends
on the optional `<font color="#82140F"><code>"message"</code></font>' string.
<p>
If no `<font color="#82140F"><code>"message"</code></font>' string is given, the the printed message will
indicate the name of the command-file and the line at which the assert
command was encountered.
<p>
If a `<font color="#82140F"><code>"message"</code></font>' string is given, and if it ends in a newline
(`<font color="#82140F"><code>"\\n"</code></font>'), then this string is printed.
<p>
If a `<font color="#82140F"><code>"message"</code></font>' string is given, and if it does not end in
`<font color="#82140F"><code>"\\n"</code></font>', then the string is printed along with an indication of the
location in the command-file.
<p>
(Perl users will recognize this as being patterned on the `<font color="#82140F"><code>"die"</code></font>'
command.)
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