$$ in shell script
$$ is the process ID (PID) of the script itself.
$BASHPID is the process ID of the current instance of Bash. This is not the same as the $$ variable, but it often gives the same result.$$ in shell script
$$ is the process ID (PID) of the script itself.
$BASHPID is the process ID of the current instance of Bash. This is not the same as the $$ variable, but it often gives the same result.what is shell scripting
A shell script is a computer program designed to be run by the Unix/Linux shell which could be one of the following:
The Bourne Shell
The C Shell
The Korn Shell
The GNU Bourne-Again Shell
A shell is a command-line interpreter and typical operations performed by shell scripts include file manipulation, program execution, and printing text.
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