line.
77 {<<#173#>file-name<#173#>>}
<<#174#>file-contents<#174#>>
78
The 79 environment is intended for bundling within a
single document file the contents of packages, options, or other
files. When the document file is run through LaTeX2e<#176#><#176#> the body of
this environment is written verbatim (preceded by a comment line) to a
file whose name is given as the environment's only argument. However,
if that file already exists then nothing happens except for an
information message.
Only normal ASCII text characters (7-bit visible text) should be
included in a 80 environment. Anything else, such as tab
characters, form-feeds or 8-bit characters, should not be included in a
81 environment.
Tabs and form feeds produce a warning, explaining that they are turned
into spaces or blank lines, respectively.
What happens to 8-bit characters depends on the TeX<#177#><#177#> installation and
is in general unpredictable.
The 82 environment is used for including LaTeX<#178#><#178#> files.
For other plain text files (such as Encapsulated PostScript files),
you should use the 83 environment which does not add a
comment line.
These environments are allowed only before 84. This
ensures that any packages that have been bundled in the document are
present when needed.