grep command

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Hi All, 

I am giving the command 

cat config.log|grep -w 'PG_VERSION'

Which gives the following Output:

| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
| #define PG_VERSION "8.3beta2"
#define PG_VERSION "8.3beta2"

But the output that I would require is 

PG_VERSION "8.3beta2" that should occur only once, can anyone please
tell me the command to get this output.

Thanks in advance

Regards
Cinu Kuriakose
 

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