I have a script like this in a bash shell script

idl << end_of_commands
print, 1
print, 2
...
print, 1000
end_of_commands

And it works fine. Then I rewrote it to have this form:

idl << end_of_commands
for i=1,1000 do begin
print,i
endfor
end_of_commands

And when I run it IDL says:

endfor
^
% Syntax error.

Thank you.