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lang-bash
[2-9]are not optional. It will cause it to fail withcsh,tcshorzshif there's no file matching that pattern in the current directory, or worse with other shells (not fish), it will fail badly and more obscurely if there are files matching that pattern in the current directory. You're right that quotes around%are necessary for thefishshell. single quotes are better than double quotes as in your earlier version since that means it also works withrcandes. As it is written now, it would work with any shell (on systems where GNUseqis installed).