.CD "vol \(en split stdin into diskette-sized volumes"
.SX "vol\fR [\fB\(enrw\fR] [\fIsize\fR] \fIblock_special"
.FL "\(enu" "Unsave from diskettes"
.EX "tar cf \(en . | vol \(enw 360 /dev/fd0" "Prompt for disk every 360K"
.EX "vol \(enr 360 /dev/fd0 | tar xf \(en " "Restore a saved file system"
.PP
It occasionally happens that a program generates an output stream intended
for diskette but the stream is to large to fit on one diskette.  \fIVol\fP is a
program that accepts such a stream, and pauses every \fIsize\fR 
blocks to request a new diskette to be inserted.  
This makes it possible to save arbitrarily long
streams on a series of diskettes, as shown in the examples above.
.PP
You do not have to use the \fB\(enr\fP or \fB\(enw\fP options if you use
\fIvol\fP on the command line, it will figure out by itself what the
direction of the data is.  The size of the device also need not be
specified if you know that the device is large enough, like a tape.
\fIVol\fP is then useful for the buffering it does, because \fItar\fP
doesn't buffer.