07-04-2011
You can open a file in vi, and then within this session, you can open multiple files using :e filename.
you can switch to other currently opened files using ctrl+6.
Do remember it will allow you to switch to other files only when your current file is in saved mode.
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FOPEN(3S) FOPEN(3S)
NAME
fopen, freopen, fdopen - open a stream
SYNOPSIS
#include <stdio.h>
FILE *fopen(filename, type)
char *filename, *type;
FILE *freopen(filename, type, stream)
char *filename, *type;
FILE *stream;
FILE *fdopen(fildes, type)
char *type;
DESCRIPTION
Fopen opens the file named by filename and associates a stream with it. Fopen returns a pointer to be used to identify the stream in sub-
sequent operations.
Type is a character string having one of the following values:
"r" open for reading
"w" create for writing
"a" append: open for writing at end of file, or create for writing
In addition, each type may be followed by a "+" to have the file opened for reading and writing. "r+" positions the stream at the begin-
ning of the file, "w+" creates or truncates it, and "a+" positions it at the end. Both reads and writes may be used on read/write streams,
with the limitation that an fseek, rewind, or reading an end-of-file must be used between a read and a write or vice-versa.
Freopen substitutes the named file in place of the open stream. It returns the original value of stream. The original stream is closed.
Freopen is typically used to attach the preopened constant names, stdin, stdout, stderr, to specified files.
Fdopen associates a stream with a file descriptor obtained from open, dup, creat, or pipe(2). The type of the stream must agree with the
mode of the open file.
SEE ALSO
open(2), fclose(3)
DIAGNOSTICS
Fopen and freopen return the pointer NULL if filename cannot be accessed, if too many files are already open, or if other resources needed
cannot be allocated.
BUGS
Fdopen is not portable to systems other than UNIX.
The read/write types do not exist on all systems. Those systems without read/write modes will probably treat the type as if the "+" was
not present. These are unreliable in any event.
In order to support the same number of open files as does the system, fopen must allocate additional memory for data structures using cal-
loc after 20 files have been opened. This confuses some programs which use their own memory allocators. An undocumented routine, f_preal-
loc, may be called to force immediate allocation of all internal memory except for buffers.
4th Berkeley Distribution May 27, 1986 FOPEN(3S)