What does $$ mean in shell script?
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How will you schedule a job that will run every month last day?(some months have 30 days,some 31 days,28,29 days)
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c program which behaves like a shell(command interpreter). it has its own prompt say "NewShell$".any normal shell command is executed from your shell by starting a child process to execute a system program corrosponding to the command
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