Question : Shell script logical operators

I want to write something like this in a korn shell script

if [ "_$ClientBox" = "_" || "_$RecBox" = "_" ||  ("_$post1" = "_" && "_$post2" = "_")  ]


This syntax gives an error. Please advise.

Answer : Shell script logical operators

The parentheses would be a problem too :-(

Better to use the [[ ]] test operator in ksh.  Takes care of both problems.

I.e. if [[ "_$ClientBox" = "_" || "_$RecBox" = "_" ||  ("_$post1" = "_" && "_$post2" = "_")  ]]