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Full Discussion: How to send data to previous program (pipe)?
Top Forums Shell Programming and Scripting How to send data to previous program (pipe)? Post 303012480 by rbatte1 on Monday 5th of February 2018 06:03:34 AM
Old 02-05-2018
The second process, cmd2, will be able to read the standard output from cmd1 You should not need to know the PID.

It's all a bit theoretical at the moment. Can you explain what you really want to achieve?


Something like ls -l | more is a simple example of this. The output from ls -l (excluding errors) is passed to more which displays the output, pausing with a prompt when it believes it has written a screenful. The shell transfers the input for the more to be reading from the output of the ls rather than from the keyboard or whatever else standard input is defined as.


I'm sure we can explain this with a better example of what you are trying to do overall.



Kind regards,
Robin
 

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LEARN ABOUT DEBIAN

funnel

funnel(1)							     logtools								 funnel(1)

NAME

       funnel - split one pipe stream to one or more files or programs

SYNOPSIS

       funnel [|] [>[>]file] [|process]

DESCRIPTION

       The funnel program will read data from standard input and write it to several output streams.

       The | symbol means to copy standard input to standard output.

       The > symbol means that a file name immediately follows with no separating spaces, the file will be truncated if it exists or created if it
       doesn't. The >> means that the file is to be appended to if it exists.

       A | symbol followed immediately by text indicates a command that is to be run by system() and will have all input piped to it.

EXIT STATUS

       0 No errors

       1 Error opening input

       Other errors are 100 + number of commands or files that fail

AUTHOR

       This program, its manual page, and the Debian package were written by Russell Coker <russell@coker.com.au>.

FEATURES

       Uses popen (3) for output so that shell expansion gets performed.  If you want such shell expansion then you must ensure that you quote the
       parameters correctly so that they get expanded by popen (3) not the shell that calls funnel.

SEE ALSO

       popen(3)

Russell Coker <;russell@coker.com.au>				       0.06								 funnel(1)
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