CODEWITHSUNDEEP
linuxrandombytefilldd
Linux Learner from S.A.
Linux Learner from S.A.

Reputation: 11

Linux fill all files recursivelly with random or pseudo random data

I want to fill with random bytes ALL files RECURSIVELLY from the root directory. ONLY FILES, folders are to be left untoutched

I DON´T WANT TO DELETE the files, just fill them with random bytes

In my research, the fill command for a single file could be something like:

dd if=/dev/random of=target-files bs=1M

And to find all files recursivelly I should use:

find . -name "* .*"

My questions are:

  1. Is it possible to achieve my goal by joining this two commands? (pipe them? how?)

  2. Is there another easier way to achieve the same results?

Thanks for any help ;-)

Upvotes: 1

Views: 561

Answers (4)

alsjflalasjf.dev
alsjflalasjf.dev

Reputation: 1689

I love dd (really: I love it!); but, in this case, you can use shred, especially designed for achieve something like this. It's part of the GNU coreutils package (installed on [almost] all linux systems).

find rootdirectory -type f -print0 | xargs --null --max-args=1 shred --force --iterations=4 --random-source=/dev/urandom --verbose

Upvotes: 0

tink
tink

Reputation: 15204

And a third approach :)

find / -type f -printf "%s\t%p\n" | while read size name ; do dd if=/dev/urandom of="${name}" bs=1c count=${size}; done

Be prepared to wait a LONG time :}

Upvotes: 0

Shamit Verma
Shamit Verma

Reputation: 3827

Find + xargs + dd + wc would do that.

 find / -type f -print0 | xargs -0 -Ifilename  sh -c 'dd if=/dev/urandom of="filename" bs=`wc -c "filename" | cut -d" " -f1` count=1'

How it works:

  1. find + xargs iterate over all files starting from /
  2. -print0 in find + -0 in xargs deal with edge cases like blank spaces / quotes / hyphen in filename etc
  3. "wc -c" provide size of file in bytes, cut extracts first word from output that has size in bytes
  4. dd fills output file with size provided by wc + cut
  5. -I in xargs specifies the variable for filenames

Upvotes: 0

Ronald Poon
Ronald Poon

Reputation: 199

You may try to pipe the find result to while loop, and dd /dev/udrandom into each files.

$ find myfolder -type f |while read fd; do dd if=/dev/urandom of=$fd bs=1M count=1;done

If you want to retain file size, may do some calculation on finding 1k block count and pass as args in dd.

$ find myfolder -type f|while read fd; do FSIZ=`stat -c %s $fd`; CNT=`expr $FSIZ / 1024`;dd if=/dev/urandom of=$fd bs=1k count=$CNT;done

Upvotes: 1

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