# expr(1)

    NAME
         expr - evaluate experession

    SYNOPSIS
         expr arg ...

    EXAMPLES

         x=`expr $x + 1`     # Add 1 to shell variable x

    DESCRIPTION

         Expr computes the value of its argument and writes the result on standard
         output.   The  valid  operators,  in  order of increasing precedence, are
         listed below.  Operators grouped by {...} have the same precedence.   The
         operators  are:  |,  &,  {<,  <=, ==, !=, >=, >}, {+, -}, *, /, %, and :.
         Parentheses are permitted.

    SEE ALSO
         sh(1), test(1).