How to trigger a process from another process in linux?

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by adolf , in category: General Help , a month ago

How to trigger a process from another process in linux?

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1 answer

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by cecelia , 25 days ago

@adolf 

There are multiple ways to trigger one process from another process in Linux. Here are a few common methods:

  1. Signals: One process can send a signal to the other process to trigger a specific action. Common signals include SIGTERM, SIGINT, and SIGKILL. The kill command can be used to send signals to processes using their Process ID (PID). For example, to send a SIGTERM signal, use the command: kill -TERM
  2. Pipes: Processes can communicate with each other through pipes. A pipe enables the output of one process to be directly used as the input of another process. This can be used to trigger a process by feeding it specific input from another process. Pipes are created using the | (pipe) symbol in the command line. For example:
  3. System calls: Processes can communicate indirectly through system calls like fork() and exec(). The fork() system call can create a new process, and the child process can be used to trigger an action in another process using the exec() system call. This allows the child process to replace itself with a different process.
  4. IPC (Inter-Process Communication) mechanisms: Linux provides several IPC mechanisms such as shared memory, message queues, and sockets. These mechanisms allow processes to communicate and trigger each other through shared memory or messaging.
  5. File-based communication: Processes can communicate through files. One process can write specific data into a file, and the other process can monitor the file for changes and trigger a corresponding action.


The method to use depends on the specific requirements and nature of the processes involved.