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I have a text file which has more than 200 lines in it, and I just want to add a new line before line 4. I'm using Windows XP. Example text file before input: header 1 header 2 header 3 details 1 details 2 After output: header 1 header 2 header 3 <----- This is new line ----> details 1 details 2 I believe you are using the echo Text >> Example.txt function? If so the answer would be simply adding a "." (Dot) directly after the echo with nothing else there. Example: echo Blah echo Blah 2 echo. #New line is added echo Next Blah khaled You can use: type text1.txt >> combine.txt echo >> combine

I am developing a GUI to launch an external long-term running background program. This background program can be given input command via stdin and use stdout and stderr to keep printing out output and error messages. I use a wx.TextCtrl object inside the GUI to give input and print output. My current code is as follows, which is mainly inspired by the "how to implemente a shell GUI window" post: wxPython: how to create a bash shell window? However, my following code uses "buffer previous output" approach, i.e., I use a thread to buffer the output. The buffered transaction output could be only

I would like to pass binary information between Python and C#. I would assume that you can open a standard in/out channel and read and write to that like a file, but there are a lot of moving parts, and I don't know C# too well. I want to do this sort of thing, but without writing a file. # python code with open(DATA_PIPE_FILE_PATH, 'wb') as fid: fid.write(blob) subprocess.Popen(C_SHARP_EXECUTABLE_FILE_PATH) with open(DATA_PIPE_FILE_PATH, 'rb') as fid: 'Do stuff with the data' // C# code static int Main(string[] args){ byte[] binaryData = File.ReadAllBytes(DataPipeFilePath); byte[] outputData;

I'm using Ghostscript to rasterize the first page of a PDF file to JPEG. To avoid creating tempfiles, the PDF data is piped into Ghoscripts's stdin and the JPEG is "drained" on stdout. This pipeline works like a charm until GS receives invalid PDF data: Instead of reporting all error messages on stderr as I would have expected, it still writes some of the messages to stdout instead. To reproduce: $ echo "Not a PDF" >test.txt $ /usr/bin/gs -q -sDEVICE=jpeg -dBATCH -dNOPAUSE -dFirstPage=1 -dLastPage=1 \ -r300 -sOutputFile=- - < test.txt 2>/dev/null Error: /undefined in Not Operand stack: