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The special line at the beginning of the script is only necessary if you want the script to be run by a certain command interpreter that is different from your logon shell or because you don't know what environment the user of the shell might be running in.

It is a special comment line that looks like:

#!/command-name

such as:

#!/usr/bin/ksh

which causes the ksh interpreter to be used for the rest of the shell script.

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Q: What line is necessary at the beginning of a script to tell the OS what to use to run the script?
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