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 $grade == 'UNSK' ]
do
.....(some codes)
done
but it raise an error:
[: too many arguments
I tried some ways but not ok.
Could you give a way to work around this. Thanks