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Cough...
What? "hexdump" is excellent for creating an ASCII version array quickly of a pure binary file to work on before reconverting back to pure binary again.
However if hexdump is not good...

An example for the first part longhand using OSX 10.7.5, default bash terminal...

Altered the binary file to show it works...
#!/bin/bash
# bin_change.sh
# This will be SSLLOOWW with large...

Firstly, give us a clue as to your OS, shell, terminal, etc...

Secondly this is not a binary file.
They are ASCII representations of hexadecimal pairs separated by space delimiters.

Thirdly...