If Java is not installed, use apt-get or yum to install Java.
[john.doe@server1 ~]# yum install java-devel
The jar command can be used to create a jar (java archive) file. Let's take an example where the /var/www/html directory contains some HTML, CSS, and JS files. The following command will create a war file named MyWebArchive.jar that contains all of the files at and below /var/www/html.
[john.doe@server1 ~]# jar -cvf MyWebArchive.jar /var/www/html added manifest adding: var/www/html/index.html(in = 0) (out = 0) (stored 0%) adding: var/www/html/about.html(in = 0) (out = 0) (stored 0%) . . .
The jar command with the t (table) and f (file) options can be used to display the contents of the compressed war archive. Notice that the compressed war archive includes a directory named META-INF, and a file named MANIFEST.MF. This file and directory are included when the compressed war archive is created.
[john.doe@server1 ~]# jar -tf MyWebArchive.war META-INF META-INF/MANIFEST.MF /var/www/html /var/www/html/index.html /var/www/html/about.html . . .
Move into the directory that you want to extract the jar files to.
/path/to/bin/jar –xf /path/to/example.jar