Aparece assim:
$ command -v ksh
/usr/bin/ksh
$ what /usr/bin/ksh
/usr/bin/ksh:
Version M-11/16/88i
SunOS 5.8 Generic 110662-24 Apr 2007
$ ksh
$ x=08
$ y=$(( 10#$x - 1 ))
$ echo "$x - $y"
08 - 7
Na seção "Avaliação aritmética" da página do manual :
Constants are of the form [ base# ] n where base is a decimal number between two and thirty-six representing the arithmetic base and n is a number in that base. If base is omitted then base 10 is used.