Shell script works in bash but not in ksh -

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i need write script test if command blablabla exists in classpath. wrote following code:

if ! hash blablabla >/dev/null 2>&1;    echo not found fi

this works fine when script executed in bash. if try in ksh, doesn't work:

#! /usr/bin/ksh  if ! hash blablabla >/dev/null 2>&1;    echo not found fi

i expect echo not found executed instead nothing. what's problem?

i believe command portable (if matters):

command -v -- some_command >/dev/null 2>&1 ||   printf '%s\n' "not found"

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