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Question
In linux, print out the PID of the last background process that was executed (for example, via the & syntax).
Answer

echo $!

^^ note that $ denotes variable expansion, and ! is special variable to represent PID of last background process executed


Question
In linux, print out the PID of the last background process that was executed (for example, via the & syntax).
Answer
?

Question
In linux, print out the PID of the last background process that was executed (for example, via the & syntax).
Answer

echo $!

^^ note that $ denotes variable expansion, and ! is special variable to represent PID of last background process executed

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20. Advanced Shell Scripting
mand, or those set by the shell itself (such as the -i option). $$ Expands to the process ID of the shell. In a () subshell, it expands to the process ID of the current shell, not the subshell. <span>$! Expands to the process ID of the most recently executed background (asynchronous) command. [I.e., after executing a background command with command &, the variable $! will give its

Summary

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

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