How to insert text using a second file in Linux

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unifdef

unifdef(1)						      General Commands Manual							unifdef(1)

NAME

       unifdef - remove preprocessor lines

SYNOPSIS

       sym] sym] sym] sym]] ...  [file]

DESCRIPTION

       simulates some of the actions of in interpreting C language preprocessor command lines (see cpp(1)).  For a valid preprocessor command line
       contains as its first character a and one of the following keywords: or The character and its associated keyword must appear  on  the  same
       line,  but  they  can be separated by spaces, tabs, and commented text.	When appropriate, the portions of code surrounded by and including
       the targeted preprocessor directives are removed, and the resultant text is written to the standard output.

       Unlike does not insert included files, interpret macros, or strip comment lines.  This means, among other things, that and macros occurring
       within the input text are not interpreted.

       Since  is  language-independent,  it  can be used for processing source files for languages other than the C language.  For example, can be
       used on FORTRAN language source files, provided the C language preprocessor commands are used.

   Options
       recognizes the following command-line options:

	      Complement the normal behavior by printing only the rejected lines.

	      Ignore text delimited by
			  sym.	In other words, text that would otherwise be affected by some action is not touched when found within the  context
			  of a preprocessor command using sym.

	      Ignore text delimited by
			  sym.

	      Replace rejected lines with blank lines
			  in the text written to the standard output.

	      Treat the input source as plain text.
			  C-language comment and quoting constructs are not recognized.

	      Define symbol
			  sym.

	      Cause symbol
			  sym to be undefined.

RETURN VALUE

       The command returns the following exit values:

	      0 	  Output is an exact copy of the input.

	      1 	  Output is not  an  exact copy of the input.

	      2 	  The command fails.  The failure might be due to a premature EOF or to an inappropriate or

EXAMPLES

       Assume file contains the following:

       The command sequence:

       produces the following result in file

WARNINGS

       Any symbol name defined in the file must be specified in the command line; otherwise, will ignore the line.

AUTHOR

       was developed in the public domain.

SEE ALSO

       cpp(1).

																	unifdef(1)

Shell Programming and Scripting