How to echo "$$PARAMTER_NM=1234"

Question

How can I print $$PARAMTER_NM=1234 in a Linux shell? I am getting the PID of my current process with $$, so the output is like:

1943PARAMTER_NM=1234

But I need:

$$PARAMTER_NM=1234

Answer 1

echo '$$PARAMTER_NM=1234'
$$PARAMTER_NM=1234

Answer 2

You can protect the contents of the string from the shell in two possible ways:

• Escape each $ like \$:

  echo "\$\$PARAMTER_NM=1234"
  

• Use single quotes:

  echo '$$PARAMTER_NM=1234'
  

Answer 3

# echo "\$\$PARAMTER_NM=1234"
$$PARAMETER_NM=1234

If you want to use a special/reserved character with double quotes (such as $) as-is - you need to use an escape character ('\') right before it.