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lang-bash
bash -c 'echo txt files are "$@"' meaningful-arg0-for-error *.txton Ubuntu 14.04, bashversion 4.3.11(1)-release, and I got:txt files are *.txt. O.otxtfiles in the current directory). See alsobash -c 'echo "${1?}"' foosh -c 'shift "$2"; echo txt files are "$@"' tentative-arg0 3 2 *.txtis fantastically inventive!info bash 'expansion, parameter'. In the man page on Ubuntu, I find Omitting the colon results in a test only for a parameter that is unset