// usage : ImageJ -macro is.txt {directory} {start increment}

arg=split(getArgument," ,");

/*
if (arg.length==0 || arg.length==2 || arg[0]=="-")
  dir=getDirectory("choose a directory");
else
  dir=arg[0];
*/
if (arg.length==0 || arg.length==2) dir="-"; else dir=arg[0];
if (dir=="-") dir=getDirectory("choose a directory");

if (arg.length==0 || arg.length==1)
  s_i="";
else
  s_i=" starting="+arg[arg.length-2]+" increment="+arg[arg.length-1];

run("Image Sequence...","open=["+dir+"]"+s_i+" sort use");