Info Catalog coreutils: String expressions coreutils: expr invocation coreutils: Relations for expr

coreutils: Numeric expressions

 
 16.4.2 Numeric expressions
 --------------------------
 
 ‘expr’ supports the usual numeric operators, in order of increasing
 precedence.  These numeric operators have lower precedence than the
 string operators described in the previous section, and higher
 precedence than the connectives (next section).
 
 ‘+ -’
      Addition and subtraction.  Both arguments are converted to
      integers; an error occurs if this cannot be done.
 
 ‘* / %’
      Multiplication, division, remainder.  Both arguments are converted
      to integers; an error occurs if this cannot be done.
 

Info Catalog coreutils: String expressions coreutils: expr invocation coreutils: Relations for expr