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Can background processes read from standard input?
No, because stdin and stdout are separate channels. Unless you explicitly pipe, there is no connection.
How do you input a background process?
2 Answers
- Run fg %watcher or fg %1 (using whatever job number you see after running jobs -l ) to put the process into the foreground.
- Type the input you want followed by return.
- Type control-Z to put it back into the background (or use stty -a and check for susp to see what your stop character is).
How to redirect standard input / output of an application?
I was working in a project, and I needed to start a secondary process from an application and pass from the application, the needed parameters and inputs to the secondary process and also capture all possible output and errors from the secondary process.
How to create a child process with redirected input and output?
It also demonstrates a technique for using anonymous pipes to redirect the child process’s standard input and output handles. Note that named pipes can also be used to redirect process I/O. The CreatePipe function uses the SECURITY_ATTRIBUTES structure to create inheritable handles to the read and write ends of two pipes.
How to redirect the output of an already running process?
The command bellow redirects the outputs (standard and error) of the process PID to FILE: The README of reredirect also explains other interesting features: how to restore the original state of the process, how to redirect to another command or to redirect only stdout or stderr.
How to redirect output to a log file and background?
Note that the &> directs both stdout and stderr to output.log Stopping with and continuing in the background with bg is equivalent to execute with & at the end of the command. If you also need that this command does not die when you leave the terminal, then you should use nohup