simple shell script, ls while loop, can't use a file

Madpanda

Trying to create a simple shell script which will do something like

while 1 (i want to create an infinite loop until broken out of)
ls -ltr filename*
sleep 100

I need to run this from a linux command line and can't read from a file. I thought there was a way to do this but I haven't been able to get it working.