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Written on OSX after `brew install unrar coreutils`; presumably works on other unices with minimal modifications.
Didn't test rars that actually have paths in them, just "flat" files. Won't include files in the rar starting with a dot.
Each shell function has its own summary line, as a comment. If there are multiple shell functions with the same name, the function with the highest number of votes is put into the file.
Note: added 'grep -v' to the end of the pipeline, to eliminate extraneous lines containing only '--'. Thanks to matthewbauer for pointing this out.
Cleanly create tempfiles using mktemp and remove them using traps instead of removing them in the end of the script. This way, you make sure the tempfiles are removed properly even if the script is killed or interrupted.
For a user script in KDE4, you can set TMPROOT using :
TMPROOT=$(kde4-config --path tmp)