Which of the following shell variable is used to return the process ID of the current shell?
A) $!
B) $$
C) $*
D) None

• $$ the process number of this shell - useful for
  including in filenames, to make them unique.
  
  
  $! the process id of the last command run in
  the background.
  
  $* a string containing all the arguments to the
  shell, starting at $1.
  
  
  SO ans (A) None
• 9 years agoHelpfull: Yes(3) No(2)
• option B : $$
• 8 years agoHelpfull: Yes(1) No(0)
• $$ returns pid
• 6 years agoHelpfull: Yes(0) No(0)