Im trying to get my program to behave in this way:

prog 1 | ./pipespy myfile.dat | prog2

the standard output of prog1 is supplied as the input to prog2 and copied into file myfile.dat.

need help

You want the tee command.
If you want to append to myfile.dat, use:
What's PipeSpy btw?

pipespy is a C++ program i was thinking of writing.
you prog1 and prog2 what type of files should it be? like should it be a C++ program,or just like text file?

Prog1 and Prog2 are any program (such as c++) or script(which is a text file) you want them to be... as long as Prog1 would normally send output to the screen, my line of code will redirect it into "myfile.dat" and also send it to "Prog2".

Perhaps it could work out this way:

prog 1 | ./pipespy myfile.dat | prog2


The executable 'pipespy' should read the standard input and before writing the data to standard output store it within a file named 'myfile.dat'

__________________
Regards,
Satya Prakash Prasad

these can be any executables. see the man pages for 'tee' and it gives a simple example using grep and wc.

hey guys,thanks for a all your help,but i cant seem to get it working.i created prog1 and prog2 has a .txt file,and i keep getting

aspasia$ prog1.txt | tee -a myfile.dat | prog2.txt
-bash: prog1.txt: command not found
-bash: prog2.txt: command not found


any suggestions?