How to run ksh script in bash shell?

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http://www.unix.com – Hi All, I have few bash shell scripts which depends on one Ksh shell script. When i run bash shell scripts, it shows error as bad interpretor : ksh no such bad file or directory. When i tried to install ksh shell, it is not downloading too. If I remove !/bin/ksh command in starting line of the script, then errors get displayed in few commands. Can anyone give me good solution for this please ? (HowTos)