print content of more than one file in a zip archive

Use the -p option of unzip to pipe the output. Multiple files are concatenated. The -c option does the same thing, but includes the file name in front of each file.

You can do this to output a file without extracting:

$ unzip -p <zip_file> <file_to_print>

For example:

$ unzip -p MyEar.ear META-INF/MANIFEST.MF

As cur4so mentioned you can also list all files using:

$ unzip -l <zip_file>