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This line unbuffers the interactive output of rsync's --progress flag
creating a new line for every update.
This output can now be used within a script to make actions (or possibly piped into a GUI generator for a progress bar)
Sends SIGINFO to the process. This is a BSD feature OS X inherited. You must have the terminal window executing dd selected when entering CTRL + T for this to work.
Sends the "USR1" signal every 1 second (-n 1) to a process called exactly "dd".
The signal in some systems can be INFO or SIGINFO ...
look at the signals list in: man kill
The previously-posted one-liner didn't work for me for whatever reason, so I ended up doing this instead.
Only slightly different than previous commands. The benefit is that your "watch" should die when the dd command has completed. (Of course this would depend on /proc being available)
Adjust "sleep X" to your needs.
*NOTE: First sleep is required because bash doesn't have a "post-test" syntax (do XXX while).
"killall -USR1 dd" does not work in OS X for me. However, sending INFO instead of USR1 works.
In this example we convert a .tar.bz2 file to a .tar.gz file.
If you don't have Pipe Viewer, you'll have to download it via apt-get install pv, etc.
every 1sec sends DD the USR1 signal which causes DD to print its progress.
Only works on single files, doesn't preserve permissions/timestamps/ownership.
Requires the dc3dd package - available at http://dc3dd.sourceforge.net
What happens here is we tell tar to create "-c" an archive of all files in current dir "." (recursively) and output the data to stdout "-f -". Next we specify the size "-s" to pv of all files in current dir. The "du -sb . | awk ?{print $1}?" returns number of bytes in current dir, and it gets fed as "-s" parameter to pv. Next we gzip the whole content and output the result to out.tgz file. This way "pv" knows how much data is still left to be processed and shows us that it will take yet another 4 mins 49 secs to finish.
Credit: Peteris Krumins http://www.catonmat.net/blog/unix-utilities-pipe-viewer/