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I came across "$$" expression in shell script, something like this
TFILE=$$
Can anyone tell me its meaning?
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$$ is the pid (process id) of the shell interpreter running your script. It's different for each process running on a system at the moment, but over time the pid wraps around, and after you exit there will be another process with same pid eventually.As long as you're running, the pid is unique to you.
The echo command is used to display a line of text that is passed in as an argument. This is a bash command that is mostly used in shell scripts to output status to the screen or to a file.
$$ means the process ID of the currently-running process.
$$ is a Bash internal variable that contains the Process ID (PID) of the shell running your script. Sometimes the $$ variable gets confused with the variable $BASHPID that contains the PID of the current Bash shell.
$$ means the process ID of the currently-running process.
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