Try this excellent solution:

jar xvf COCR2_100.zip

steps:

1. drag and drop file into terminal window.
2. use keyboard arrows to navigate to start of line in terminal
3. type jar xvf in front of your file name, remembering to leave space before the start of your file name.
4. grab a beer and watch terminal work its magic as it extracts files.

The location of where the new files go varies, but usually best trick to find them is click on your computer name in Finder which should display most recent activity at top of all files.

If the jar command is not available, you can install fastjar by pasting the following in terminal:

sudo apt-get install fastjar

 git archive -o f83a9df9.tar.gz HEAD   $(git diff-tree -r --no-commit-id --name-only --diff-filter=ACMRT f83a9df9 bd1773dd)

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The zgrep program is available for Linux (and perhaps some Unix too). This will decompress the files and then grep through them.

find . -iname '*.gz' -print0 | xargs -0 zgrep PATTERN