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How to get the PID of the current subshell?
– Expands to the current option flags as specified upon invocation, by the set builtin command, or those set by the shell itself (such as the -i option). $ Expands to the process ID of the shell.
How to get PID of process in shell script?
It’s very straight forward. ABCD should be replaced by your process name. Sometimes you need to replace ABCD by software name. Example – if you run a java program like java -jar TestJar.jar & then you need to replace ABCD by TestJar.jar. You can also do away with grep and use only awk.
How to get PID back from kill Stack Overflow?
The script it is trying to kill starts many other scripts so I am hoping that killing start.sh will kill all child processes. you create a subshell with the word start.sh in it. grep will then pick up on its own process and the start.sh one so you will get two PIDs back.
Can a kill signal be sent to a PID?
Once it finds that PID it then sends a kill signal. I can find the PID but the kill signal does not process, I get a return message that it is not a PID.
How to get process ID ( PID ) of a shell script?
For example, PPID stores the process ID of the subshell’s parent process (i.e., main shell). UID stores the user ID of the current user who is executing the script. For example: In the above, PID will keep changing every time you invoke a script. That is because each invocation of a script will create a new subshell.
What does a subshell do in a shell script?
When you execute a shell script, it will launch a process known as a subshell. As a child process of the main shell, a subshell executes a list of commands in a shell script as a batch (so-called “batch processing”). In some cases, you may want to know the process ID (PID) of the subshell where your shell script is running.
Which is the same as bashpid in the main shell?
In the main shell, $BASHPID is the same as $$. In the subshell, it is updated to the subshell’s PID. Pre version 4, you need a workaround: Why the colon? Notice that, without the colon, the work-around does not work: It appears that, in the above, a subshell is never created and hence the second statement returns the main shell’s PID.