True is a [boolean] value. It is recognised by [expr]. 

   1. True values are '''yes''', '''on''', '''true''', their abbrevations, and non-zero integers, 
   2. False values are '''no''', '''off''', '''false''', their abbrevations, and the integer '''0'''.

The function '''[string is] true''' returns true if its argument obeys the condition 1. above (and '''[string is] false''' does the opposite).

The canonical form for true, like in C, is integer 1. To wit:
 % expr 42==42
 1

[1S] See also: [Boolean], [magic names]


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