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I am viewing a ksh script and I see a function where the variable has been defined as below. Can anyone explain what exactly the below assignment of variable means in ksh script?

temprule="\$${APPLC_NM}"
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As @Julie Pelletier indicated, this is funny syntax to make a indirect variable, or a nameref. ksh has some specialized syntax to make this work, however. This is a feature of ksh, and might not work in other shells.

The more idiomatic way to write the same in ksh would look like this:

# Set up the nameref:
nameref temprule=APPLC_NM
# Assign value to AAPLC_NM
APPLC_NM=abc
# The above two statements may be executed in any order.

# Now, temprule will contain the value of APPLC_NM:
echo $temprule
abc

Now, no funny escaping of double $ is necessary, and the result is arguably more readable.

  • Your code does not prepend the variable contents with a '$' which is the result of OP's question. That probably means that the variable content is used as a variable name later on. – Julie Pelletier May 6 '16 at 17:51
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temprule will be assigned '$' followed by the value of the variable APPLC_NM. So if APPLC_NM is set to "pizza", temprule will become "$pizza".

Note that temprule="\$$APPLC_NM" would do the exact same thing. The brackets are only needed when the variable name is followed by a character that would be valid in a variable name.

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