What is the meaning of this statement?

Shell Programming and Scripting
1 
Temp=${PATH_PROC_USER:=""}

Thanks for your time and answer.

2

Set a variable called TEMP to the value of the variable PATH_PROC_USER if PATH_PROC_USER has a value. If PATH_PROC_USER does not have a value (is null), set Temp to a null string (the ""). Which is what it is already.

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3

Thanks for answering

sort -r -t";" -k1,1 -k15,15

what r is doing here?

4

Reversing the sort.

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