To manipulate war files, you need a command called jar, and this command is available from openjdk-devel package.
Install openjdk-devel -y
# yum install java-1.8.0-openjdk-devel
You should be able to use jar command
# which jar
/usr/bin/jar
View the content of a war file
# jar tf sample.jar
Extract the content of a war file
# jar xf sample.jar
Create war from files
# jar cf sample.jar /path/to/files
