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I like your forum, I think it says something that is very reasonable. I will always look to this forum, hoping each time to see some different things.

[ $FILE == "" ] You only get == in bash and ksh, and even then, only in [[ ]] not [ ].

Try [ -z "$FILE" ] instead, that should work in any shell.

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You already put the content lines of the file into an array, so you can use the array index to display the line number. Using an extra counter is not necessary. Please see the comments in the code...