PROJ4 command for printing to output file <p>I am working with Regional Climate data that were provided in a rotated pole grid format. Using PROJ4 I can convert these coordinates to lat/lon using this command line $ proj -m 57.295779506 +proj=ob_tran +o_proj=latlon +o_lon_p=83 +o_lat_p=42.5 +lon_0=180 I have created an ASCII file with the coordinates of all the grid cells ifile.txt and an empty file for the output ofile.txt</p> <p>When I use $ proj -m 57.295779506 +proj=ob_tran +o_proj=latlon +o_lon_p=83 +o_lat_p=42.5 +lon_0=180 ifile.txt ofile.txt</p> <p>I get the transformed coordinates printing to the screen but not to ofile.txt. Can someone suggest how I can fix my command line? </p> <p>Thank you for your time</p>