LinuxQuestions.org - [SOLVED] Using dd command to write bytes

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Using dd command to write bytes

I'm using

Code:

dd if=/dev/zero bs=5 count=1 of=binfile

Then I run

Code:

hexdump -b binfile

0000000 000 000 000 000 000

How can I use dd to write bytes of 1 or 5 for example?
hexdump -b will return
0000000 001 001 001 001 001
or
0000000 005 005 005 005 005

Maybe with something like this:

Code:

$ for i in {1..5}; do echo -n $'\x01'; done | dd of=binfile

0+1 records in

0+1 records out

5 bytes (5 B) copied, 7.0541e-05 s, 70.9 kB/s

$ hexdump -b binfile

0000000 001 001 001 001 001                                            

0000005

Another option is to use /dev/zero and change zeros on the fly using sed, e.g.

Code:

$ dd if=/dev/zero bs=5 count=1 | sed 's/\x00/\x01/g' > binfile

1+0 records in

1+0 records out

5 bytes (5 B) copied, 2.4654e-05 s, 203 kB/s

$ hexdump -b binfile

0000000 001 001 001 001 001                                            

0000005

The tr command may serve the same purpose.

Thank you very much.

I used the second option because I needed to add the bytes at the end of the file.

Worked great!