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Try this line instead as the --md5 is being mistaken for a command line and the quotes may help too.

if grep -Fxq -- "$GRUBPASSWD" /etc/grub.conf

Thinks this is what you're after, each version does exactly the same as that shell snippet, but each time it removes one layer of default action that awk does for you to demonstrate how you can...

awk loops for each line in the file placing the line contents in $0 variable so what you want is

awk '
{
print $0;
}
' ab

assuming ab is your file

I think this is what you want. It's one inline script calling a ksh which has two parts, the one surrounded by double quotes (") gets expanded on the local machine, allowing remote $variables to be...

This should do what you want using the sample.txt file as attached to your post.

awk -F'|' '

BEGIN {
# Get the heading line out of the way
getline;
h2=$2;
...