How do I append onto pipes?
So my question is if I can somehow send data to my program and then send the same data AND its result to another program without having to create a temporary file (in my case ouputdata.txt). Preferably using linux pipes/bash.
I currently do the following:
cat inputdata.txt | ./MyProg > outputdata.txt
cat inputdata.txt outputdata.txt | ./MyProg2
Choice 1 - fix MyProg to write the merged output from the input and it's own output. Then you can do this.
./MyProg <inputdata.txt | ./MyProg2
Choice 2 - If you can't fix MyProg to write both input and output, you need to merge.
./MyProg <inputdata.txt | cat inputdata.txt - | ./MyProg2
Here is another way, which can be extended to put the output of two programs together:
( Prog1; Prog2; Prog3; ... ) | ProgN
That at least works in Bash.