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It works, thanks Niyati. A little curious, why we have to use [[ instead of [ in test expression. Is there any special meaning here?.

Thanks so much.
Baton

I'm writing a shell script with bash ver 2.05b in linux. My script has a test with 5 arguments like this:

until [ $grade == 'SSK' -o $grade == 'HSK' -o $grade == 'SK' -o $grade == 'SMSK' -o...