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a little hint:

set a counter while printing, when it reaches 10, read a carriage return from stdin (in my code, it would be '&6' and then proceed.

sed 's/^\s*[pP][rR][iI][nN][tT]/#print/' a.txt

here '\s' represents any blank space, tab.

==========================================
> cat > a.sh
#!/bin/bash

exec 6<&0
exec < a.sh
while read line
do
echo $line
done
exec 0<&6
'ctrl-D'
>
>
> ./a.sh
#!/bin/bash
...

> cat a.txt
a = "This is a print statement
print a
b = "This contains print statement"
print b
>
>
>
> sed 's/^[pP][rR][iI][nN][tT]/#print/' a.txt
a = "This is a print statement
#print a
b...

What you can do in a script is as below:

=======================================
mailx -s "test" whoever@wherever.com <<-EOF
hello
EOF
=======================================

You can use...