Info Catalog m4: Text handling m4: Index macro

m4: Len

 
 11.1 Calculating length of strings
 ==================================
 
 The length of a string can be calculated by ‘len’:
 
  -- Builtin: len (STRING)
      Expands to the length of STRING, as a decimal number.
 
      The macro ‘len’ is recognized only with parameters.
 
      len()
      ⇒0
      len(`abcdef')
      ⇒6
 

Info Catalog m4: Text handling m4: Index macro