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bashshellcommand-linestdoutdd

How to redirect dd progress in terminal to a log file after replacing carriage returns with newline characters

Any idea why this command isn't working?

dd if=/dev/zero of=/dev/null status=progress |& tr '\r' '\n' >> test.txt

I want the contents of test.txt to look something like this.

395191296 bytes (395 MB, 377 MiB) copied, 1 s, 395 MB/s
805187584 bytes (805 MB, 768 MiB) copied, 2 s, 403 MB/s
1239563264 bytes (1.2 GB, 1.2 GiB) copied, 3 s, 413 MB/s
1666015232 bytes (1.7 GB, 1.6 GiB) copied, 4 s, 417 MB/s

Right now the command is printing nothing to test.txt

Solution

  • It's all because of tr wait for its job finish, which will take an infinite time.

    unbuffer can help you in this situation:

    dd if=/dev/zero of=/dev/null status=progress |& unbuffer -p tr '\r' '\n' >>test.txt