If you have a *.jar package on your IFS and you need to know which version this package is.
With this command you can you can show Manifest for log4j.jar file
unzip -p log4j.jar META-INF/MANIFEST.MF
Manifest-Version: 1.0
Export-Package: org.apache.log4j.net;uses:="org.apache.log4j,org.apache
Built-By: cy
Tool: Bnd-0.0.357
Bundle-Name: Apache Log4j
Created-By: Apache Maven Bundle Plugin
Bundle-Vendor: Apache Software Foundation
Build-Jdk: 1.6.0_23
Bundle-Version: 1.2.17
Bnd-LastModified: 1336302107501
Bundle-ManifestVersion: 2
Bundle-License: http://www.apache.org/licenses/LICENSE-2.0.txt
Bundle-Description: Apache Log4j 1.2
Bundle-DocURL: http://logging.apache.org/log4j/1.2
Bundle-SymbolicName: log4j
Import-Package: javax.jmdns;resolution:=optional,javax.jms;resolution:
=optional,javax.mail;resolution:=optional,javax.mail.internet;resolut
ion:=optional,javax.management,javax.naming,javax.xml.parsers,org.w3c
.dom,org.xml.sax,org.xml.sax.helpers
Name: org.apache.log4j
DynamicImport-Package: *
Implementation-Vendor: "Apache Software Foundation"
Implementation-Title: log4j
Implementation-Version: 1.2.17