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Is it possible to get the child process id from parent process id in shell script?
I have a file to execute using shell script, which leads to a new process process1 (parent process). This process1 has forked another process process2(child process). Using script, I'm able to get the pid of process1 using the command:
cat /path/of/file/to/be/executed but i'm unable to fetch the pid of the child process.
864
A child process is created as its parent process's copy and inherits most of its attributes. If a child process has no parent process, it was created directly by the kernel. If a child process exits or is interrupted, then a SIGCHLD signal is send to the parent process.
Using the /proc File System It contains information about the kernel, system, and processes. We can find the PIDs of the child processes of a parent process in the children files located in the /proc/[pid]/task/[tid] directories.
fork already returns the child's pid. Just store the return value. Upon successful completion, fork() returns a value of 0 to the child process and returns the process ID of the child process to the parent process.
How to get a parent PID (PPID) from a child's process ID (PID) using the command-line. e.g. ps -o ppid= 2072 returns 2061 , which you can easily use in a script etc. ps -o ppid= -C foo gives the PPID of process with command foo . You can also use the old fashioned ps | grep : ps -eo ppid,comm | grep '[f]oo' .
Just use :
pgrep -P $your_process1_pid I am not sure if I understand you correctly, does this help?
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