How does a Linux Unix Bash script know its own PID

Question

I have a script in Bash called Script sh  and it needs to know its own PID  i e  I need to get PID inside the Script sh     Any idea how to do this

User · Answer

use  BASHPID or    See the  manual  1  for more information  including differences between the two  TL DRTFM     Expands to the process ID of the shell   In a    subshell  it expands to the process ID of the invoking shell  not the subshell     BASHPID Expands to the process ID of the current Bash process  new to bash 4    In a    subshell  it expands to the process ID of the subshell  1   http   www gnu org software bash manual bashref html Bash-Variables

User · Answer

In addition to the example given in the Advanced Bash Scripting Guide referenced by Jefromi  these examples show how pipes create subshells     echo     BASHPID   cat - 11656 31528   echo     BASHPID 11656 11656   echo      while read line  do echo  line     BASHPID  done 11656 11656 31497   while read line  do echo  line     BASHPID  done  lt  lt  lt     11656 11656 11656

User · Answer

You can use the    variable

User · Answer

If the process is a child process and  BASHPID is not set  it is possible to query the ppid of a created child process of the running process  It might be a bit ugly  but it works  Example   sleep 1  amp  mypid   ps -o ppid  -p

User · Answer

The PID is stored in      Example  kill -9    will kill the shell instance it is called from

User · Answer

The variable      contains the PID

[bash] How does a Linux/Unix Bash script know its own PID?

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