best way to insert a line at the top of a file?

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tmpfile

tmpfile(3)						     Library Functions Manual							tmpfile(3)

NAME

       tmpfile -  Creates a temporary file

LIBRARY

       Standard C Library (libc.so, libc.a)

SYNOPSIS

       #include <stdio.h>
       FILE *tmpfile ( void );

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       tmpfile():  XSH4.2

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

DESCRIPTION

       The tmpfile() function creates a temporary file and returns its FILE pointer. The file is opened for update. The temporary file is automat-
       ically deleted when the process using it terminates.

RETURN VALUES

       Upon successful completion, the tmpfile() function returns a pointer to the stream of the file that is created.	Otherwise,  it	returns  a
       null pointer and sets errno to indicate the error.

ERRORS

       The tmpfile() function sets errno to the specified values for the following conditions:

       A signal was caught during tmpfile().  OPEN_MAX file descriptors are currently open in the calling process.

	      [Tru64  UNIX]  All  available  file descriptors are currently open in the calling process.  The maximum allowable number of files is
	      currently open in the system.  The directory or file system that would contain the new file cannot be expanded.

RELATED INFORMATION

       Functions: fopen(3), mktemp(3), tmpnam(3), unlink(2), getdtablesize(2)

       Standards: standards(5) delim off

																	tmpfile(3)

Shell Programming and Scripting