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Can you explain this? Where we can find out the flat file?

Thanks!
I have tried the below code for listing out all the shells:

#!/bin/bash
echo $SHELL
#!/bin/sh
echo $SHELL
#!/bin/csh
echo $SHELL
#!/bin/ksh
echo $SHELL
#!/bin/csh
echo $SHELL...

Thanks!!
pandeeswaran@ubuntu:~$grep "pandeeswaran" /etc/passwd|cut -d: -f7
/bin/bash
also works

---------- Post updated at 11:53 PM ---------- Previous update was at 11:51 PM ----------

i...

for example, if we specify,#!/usr/bin/ksh then the script will be executed in korn shell.
If we don't specify that line, the script will be executed using the default shell.
So, how we can identify...