fprocopen - Linux


fprocopen is a command-line utility used to open files and processes from within a running Python script. It provides a convenient way to interact with external resources directly from Python code, enabling efficient data exchange and process management.


fprocopen [options] [--] [command | script | file] [args...]


  • -h, –help: Display usage information and exit.
  • -v, –version: Show version information and exit.
  • -q, –quiet: Suppress output except for errors.
  • –stdin: Read input from standard input.
  • –stdout: Write output to standard output.
  • –stderr: Write error output to standard error.
  • –args: Pass arguments to the command or script.
  • –env: Pass environment variables to the command or script.
  • –cwd: Set the current working directory for the command or script.
  • –shell: Execute the command or script in a shell.


Open a file for reading:

fprocopen filename.txt

Open a command for piping input and output:

fprocopen ls | grep 'important'

Run a Python script with arguments:

fprocopen myscript.py --option1 value1 --option2 value2

Common Issues

  • Ensure that the file or command you’re trying to open exists and has the correct permissions.
  • Handle input and output streams appropriately to avoid blocking or data corruption.
  • Use the --stdin, --stdout, and --stderr options as needed to control the flow of data.


fprocopen can be combined with other Linux commands to create powerful scripts and automations. For instance, it can be used to:

  • Execute arbitrary commands from Python scripts.
  • Read and process data from external files or processes.
  • Pipe data between multiple commands or scripts.

Related Commands

  • subprocess Python module: Similar functionality for opening processes from Python code.
  • open command: Opens files or URLs.
  • bash command: Opens a shell for executing commands.