Environment Question: Download Linux Environment PDF

Which variable contains current shell process id:
a) $*
b) $?
c) $$
d) $!

c) $$

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While executing a command, the shell: a) Executes it in the same process (as shell) b) Creates a child shell to execute it c) Loads a special program to take care of the execution d) None of the above	Which command is used to debug a shell script program: a) set b) set -x c) debug d) db