This small utility is useful to grab some data in the middle of a file.
Usage is very simple: if you run 'GrabInFile ram:in 1024 1040 ram:out' or
(equivalently) 'GrabInFile ram:in 1024 -16 ram:out' it will save bytes
1024-1039 (16 bytes) from 'ram:in' to 'ram:out'.
It's optimised to work with large files (256kbyte I/O buffer).

By using GrabInFile and join you are also able to substitute some bytes in
the middle of a file.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 6907   10832  63.8% -lh5- 05bf Feb 17  1998 GrabInFile/GrabInFile
[generic]                  363     620  58.5% -lh5- 5ff1 Feb 17  1998 GrabInFile/GrabInFile.readme
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         2 files    7270   11452  63.5%            Feb 19  1998