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Question
In linux, how do you print out the PID of the current shell?
Answer

echo $$

^^ note that $ denotes variable expansion, and $ (the second one:) is special variable to represent PID of current shell


Question
In linux, how do you print out the PID of the current shell?
Answer
?

Question
In linux, how do you print out the PID of the current shell?
Answer

echo $$

^^ note that $ denotes variable expansion, and $ (the second one:) is special variable to represent PID of current shell

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20. Advanced Shell Scripting
., the exit code of the last command.] $- 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). <span>$$ Expands to the process ID of the shell. In a () subshell, it expands to the process ID of the current shell, not the subshell. $! Expands to the process ID of the most recently executed

Summary

statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill

Details

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