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shell script.

How to return a command from child shell to parent?
suppose  i want to write a shell script for setting a directory
for example in dos i will write a bat file
with commands

cd /home/kunal

but in linux can i write a shell script to do the same if yes then tell
me more about it.
i have tried it but after execution of shell script it shows the same
direcotry without any chanfg