## Function: SB-UNIX:UNIX-LSEEK
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> Unix-lseek accepts a file descriptor and moves the file pointer by
> OFFSET octets.  Whence can be any of the following:
> 
> L_SET        Set the file pointer.
> L_INCR       Increment the file pointer.
> L_XTND       Extend the file size.
> 

### Lambda list
```cl
(sb-unix:fd sb-unix::offset sb-unix::whence)
```