How to Extract and Inspect JAR Files Using Command‑Line Tools

JAR files are the de‑facto standard for packaging Java code, typically as .jar , .war , or .ear archives, representing standalone applications, web applications, or enterprise applications respectively.

Below are common command‑line commands for working with JAR files:

Extract the entire contents of a JAR to the current directory (the original JAR remains unchanged):

jar xvf /path/to/file.jar

List the files inside a JAR without extracting:

jar tvf /path/to/file.jar

Extract a specific file (e.g., file1_in_jar.txt ) from the JAR:

jar xvf /path/to/file.jar file1_in_jar.txt

If the jar tool is unavailable, you can treat the JAR as a ZIP archive and use unzip :

unzip /path/to/file.jar

To list the contents of the JAR with unzip without extracting:

unzip -l /path/to/file.jar

Because JAR files share the ZIP format, any utility that can read ZIP files can also read JAR files; in some cases renaming the file to have a .zip extension may be necessary for certain tools.