I use Agent Ransack to grep entire directories. But it doesn't unzip JAR files before looking into them, is there any tool that does that?
Try using unzip:
unzip -p your_file.jar | grep "your_search"
From the man page:
-p extract files to pipe (stdout). Nothing but the file data is sent to
stdout, and the files are always extracted in binary format, just as
they are stored (no conversions).
3 years ago