question about tcl command.

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u24c02

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Hi i have question about tcl in design compiler.


set SYNVER [getenv SYNVER]

Does anyone explain to me above command?
What is this [ ] and what this have meaning at all?
thanks
 

getenv SYNVER is for getting environment variable. above mentioned command will set SYNVER to the environment variable SYNVER.
 

The [] means to execute the command inside the brackets (getenv), and return the result for use in the next command (set).
 

set SYNVER $env(SYNVER), should give the same result.
 

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