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13.1.7 Output File Control

By default the output is sent to the file whose name is obtained by appending the .pp suffix to the name of the input file (if the file with this name already exists, it is unconditionally overwritten). Thus if the input file is my_ada_proc.adb then gnatpp will produce my_ada_proc.adb.pp as output file. The output may be redirected by the following switches:

-pipe
Send the output to Standard_Output
-o output_file
Write the output into output_file. If output_file already exists, gnatpp terminates without reading or processing the input file.
-of output_file
Write the output into output_file, overwriting the existing file (if one is present).
-r
Replace the input source file with the reformatted output, and copy the original input source into the file whose name is obtained by appending the .npp suffix to the name of the input file. If a file with this name already exists, gnatpp terminates without reading or processing the input file.
-rf
Like -r except that if the file with the specified name already exists, it is overwritten.
-rnb
Replace the input source file with the reformatted output without creating any backup copy of the input source.
--eol=xxx
Specifies the format of the reformatted output file. The xxx string specified with the switch may be either

Options -pipe, -o and -of are allowed only if the call to gnatpp contains only one file to reformat. Option --eol cannot be used together with -pipe option.