The suggestion for a -w switch lead me on the right path. I added something under /tmp for it, and it then tried to add the first file. Unfortunately, it added the file in a corrupt manner. Then I stumbled across this little gem in /usr/share/doc/rar/rar.txt:
Quote:
In a UNIX environment you need to quote wildcards to avoid them
being expanded by shell. For example, this command will extract
*.asm files from RAR archives in current path:
rar e '*.rar' '*.asm'
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d'oh!