'\" t
.\" @(#)extcheck.1 1.6 99/02/19 SMI;
.\" Copyright 1999 Sun Microsystems, Inc. All rights reserved.
.\" Copyright 1999 Sun Microsystems, Inc. Tous droits r\351serv\351s.
.\" `
'\"macro stdmacro
.TH extcheck 1 "18 Feb 1999"
.SH NAME
extcheck \- jar conflict detection utility
.SH SYNOPSIS
.B extcheck 
[ 
.B -verbose 
] 
.B targetfile.jar
.SH DESCRIPTION
.IX "jar conflict detection utility" "" "jar conflict detection utility \(em \fLextcheck\fP"
.IX "extcheck" "" "\fLextcheck\fP \(em jar conflict detection utility"
The 
.B extcheck 
utility checks a specified Jar file for title and
version conflicts with any extensions installed in the JDK\(tm
software. Before installing an extension, you can use this utility
to see if the same or a more recent version of the extension is
already installed.
.LP
The 
.B extcheck 
utility compares the Specification-title and
Specification-version headers in the manifest of 
.I targetfile.jar
file against the corresponding headers in all Jar files currently
installed in the extension directory. (The extension directory is
.B jre/lib/ext
by default.) The 
.B extcheck 
utility compares version
numbers in the same way as the method
.BR java.lang.Package.isCompatibleWith .
.LP
If no conflict is detected, the return code is 
.BR 0 .
.LP
If the manifest of any of the 
.SM jar 
file in the extensions directory
has the same Specification-title and the same or a newer
Specification-version number, a non-zero error code is returned. A
non-zero error code is also returned if 
.I targetfile.jar 
does not
have the Specification-title or Specification-version attributes
in its manifest.
.LP
.SH OPTIONS
.TP 15
.B -verbose
Lists Jar files in the extension directory as they are
checked. Additionally, manifest attributes of the target 
.SM jar
file and any conflicting 
.SM jar 
files are also reported.
.SH ATTRIBUTES
See
.BR attributes (5)
for a description of the following attributes:
.sp
.TS
box;
cbp-1 | cbp-1
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
=
Availability	SUNWjvdev
.TE
.SH SEE ALSO
.BR jar (1)