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Thank you Vino. Also alot easier to do it this way.

Hello. Just trying to write this line to an empty file. CAT shows nothing was written. Any suggestions or answers?

#!/bin/bash -x
THIS=FIRSTLINE
sed '1w '$THIS'' testfile
cat testfile
...

Thanks.

This worked. Somewhat.. I added atleast 1 line to testfile.txt. But in production i will need to create this line first before there is anything else. Is there a way to do this in the...

I was only touching file to create on the fly. I need to use sed. The '1i' and the 'i' in the format i posted does not work.

Hello. Trying to insert text at line 1 and after last line of file. I have searched posts but nothing seems to work. I keep getting extra characters error or nothing gets inserted into the file.
...

Thanks Penguin. I did something like that. The input file will have comments embedded so first I get rid of all the junk and then dynamically create arrays and populate.

idx=1
while read...

Hello. I have a input file in this format:
line1data :: line1data :: line1data
line2data :: line2data :: line2data

I would like to split each lines data element into an array:
...