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bash scripting simple question

Presently i'm using this script like this :

./myscipt.sh file1.txt.

But for personnal reason I would like to use it this way :

cat file1.txt | myscript.sh

and i can't find out how...

thanks for your help

#!/bin/sh
:
# Start sending data
(
copies=1
files="$1"
i=1
while [ $i -le $copies ] ; do
for file in $files ; do
# insert init strings here
printf "\033E" # Reset printer
printf "\033&k2S" # Compress printing
printf "\033&k2G" # crlf
printf "\033(s3B" # bold
cat ${file}
printf "\014" # Send form feed
done
i=`expr $i + 1`
done
) | lp -s -dW1PP

you'd use a while read loop...

Code:

#!/bin/sh



a=1

b=2

c=whatever



while read A_LINE_OF_TEXT

do

  something -to $A_LINE_OF_TEXT

done