Commands tagged pv (37)

  • NOTE: When doing these commands when asked for questions there might be flowing text from the pv doing the progress bar just continue typing as if its not there, close your eyes if it helps, there might be a yes or no question, type "yes" and ENTER to it, and also it will ask for a password, just put in your password and ENTER I talk alot more about this and alot of other variations of this command on my site: Show Sample Output

    cd /srcfolder; tar -czf - . | pv -s `du -sb . | awk '{print $1}'` | ssh -c arcfour,blowfish-cbc -p 50005 [email protected] "tar -xzvf - -C /dstfolder"
    bhbmaster · 2013-05-30 07:21:06 0
  • forgot to use a pv or rsync and want to know how much has been copied. Show Sample Output

    watch ls -lh /path/to/folder
    vonElfensenf · 2014-03-27 10:51:36 1
  • This will write to TAPE (LTO3-4 in my case) a backup of files/folders. Could be changed to write to DVD/Blueray. Go to the directory where you want to write the output files : cd /bklogs Enter a name in bkname="Backup1", enter folders/files in tobk="/home /var/www". It will create a tar and write it to the tape drive on /dev/nst0. In the process, it will 1) generate a sha512 sum of the tar to $bkname.sha512; so you can validate that your data is intact 2) generate a filelist of the content of the tar with filesize to $bkname.lst 3) buffer the tar file to prevent shoe-shining the tape (I use 4GB for lto3(80mb/sec), 8gb for lto4 (120mb/sec), 3Tb usb3 disks support those speed, else I use 3x2tb raidz. 4) show buffer in/out speed and used space in the buffer 5) show progress bar with time approximation using pv ADD : To eject the tape : ; sleep 75; mt-st -f /dev/nst0 rewoffl TODO: 1) When using old tapes, if the buffer is full and the drive slows down, it means the tape is old and would need to be replaced instead of wiping it and recycling it for an other backup. Logging where and when it slows down could provide good information on the wear of the tape. I don't know how to get that information from the mbuffer output and to trigger a "This tape slowed down X times at Y1gb, Y2gb, Y3gb down to Zmb/s for a total of 30sec. It would be wise to replace this tape next time you want to write to it." 2) Fix filesize approximation 3) Save all the output to $bkname.log with progress update being new lines. (any one have an idea?) 4) Support spanning on multiple tape. 5) Replace tar format with something else (dar?); looking at xar right now (, xml metadata could contain per file checksum, compression algorithm (bzip2, xv, gzip), gnupg encryption, thumbnail, videopreview, image EXIF... But that's an other project. TIP: 1) You can specify the width of the progressbar of pv. If its longer than the terminal, line refresh will be written to new lines. That way you can see if there was speed slowdown during writing. 2) Remove the v in tar argument cvf to prevent listing all files added to the archive. 3) You can get tarsum ( and add >(tarsum --checksum sha256 > $bkname_list.sha256) after the tee to generate checksums of individual files !

    bkname="test"; tobk="*" ; totalsize=$(du -csb $tobk | tail -1 | cut -f1) ; tar cvf - $tobk | tee >(sha512sum > $bkname.sha512) >(tar -tv > $bkname.lst) | mbuffer -m 4G -P 100% | pv -s $totalsize -w 100 | dd of=/dev/nst0 bs=256k
    johnr · 2014-07-22 15:47:50 1

  • 0
    (pv -n centos-7.0-1406-x86_64-DVD.img | dd of=/dev/disk4 bs=1m conv=notrunc,noerror) 2>&1 | dialog --gauge "Copying CentOS to USB Stick in /dev/disk4" 10 70 0
    TuxOtaku · 2015-01-19 19:36:15 1
  • Create a file with random binary content. Required pv, units packages. It use openssl to encrypt zeros using aes-256 and time stamp as password to generate a pseudo-random file. Show Sample Output

    s=1G bs=16K; count=`units ${s}iB ${bs}iB -1 -t --out="%.f"`; openssl enc -aes-256-ctr -pass pass:`date +%s%N` -nosalt < /dev/zero 2>/dev/null | dd iflag=fullblock bs=$bs count=$count | tee $s | pv -s $s | md5sum | sed -e "s/-/$s/" > ${s}.md5
    jcppkkk · 2015-09-30 06:27:39 0
  • Due to @tremby, here: I'm looking for a way to parallelize openssl and feed that to dd since openssl is the bottleneck on my machine:

    openssl enc -aes-256-ctr -pass pass:"$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64)" -nosalt </dev/zero | pv --progress --eta --rate --bytes --size 8000632782848 | dd of=/dev/md0 bs=2M
    diagon · 2016-01-05 19:36:03 4
  • first line is the speed the uncompressed data is read, second line is the compressed data sent over ssh. change sdb to your target drive/partition to be backed up. change pbzip -c1 to suit your compression. and ssh to your target file. don't forget to run zerofree/fstrim first! Show Sample Output

    dd if=/dev/sdb | pv -rabc | pbzip2 -c1 | pv -rabc | ssh [email protected] 'cat > /dump.bz2'
    sexyrms · 2016-06-19 23:27:03 0
  • Sets the size of the disk to $DISKSIZE so that the percentage readout of pv is correct. set /dev/sdb to whatever your disk is /dev/sdX. Next pipe dd to pv, then pipe pv to gzip so that you get a gzipped image file. Show Sample Output

    DISKSIZE=`sudo blockdev --getsize64 /dev/sdb` && sudo dd bs=4096 if=/dev/sdb | pv -s $DISKSIZE | sudo gzip -9 > ~/USBDRIVEBACKUP.img.gz
    frame45 · 2016-08-31 00:03:56 0
  • uses the wonderful 'pv' command to give a progress bar when copying one partition to another. Amazing for long running dd commands Show Sample Output

    pv -tpreb /dev/sdc2 | dd of=/dev/sdb2 bs=64K conv=noerror,sync
    4fthawaiian · 2016-12-22 03:18:09 0
  • Change your drive letter as you wish. Using pv command for speed detect.First of all you must install pv command for usage. [email protected] Show Sample Output

    cat /dev/sda | pv -r > /dev/null
    kerim · 2011-01-23 22:58:56 2
  • Only works on single files, doesn't preserve permissions/timestamps/ownership. Show Sample Output

    pv file1 > file2
    ppaschka · 2010-02-25 19:18:32 0
  • the f is for file and - stdout, This way little shorter. I Like copy-directory function It does the job but looks like SH**, and this doesn't understand folders with whitespaces and can only handle full path, but otherwise fine, function copy-directory () { ; FrDir="$(echo $1 | sed 's:/: :g' | awk '/ / {print $NF}')" ; SiZe="$(du -sb $1 | awk '{print $1}')" ; (cd $1 ; cd .. ; tar c $FrDir/ )|pv -s $SiZe|(cd $2 ; tar x ) ; } Show Sample Output

    (cd /source/dir ; tar cv .)|(cd /dest/dir ; tar xv)
    marssi · 2009-07-19 10:31:13 6
  •  < 1 2

What's this? is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Check These Out

Find 10 largest files in git history

Find and copy files from subdirectories to the current directory

Lists all listening ports together with the PID of the associated process
This command is more portable than it's cousin netstat. It works well on all the BSDs, GNU/Linux, AIX and Mac OS X. You won't find lsof by default on Solaris or HPUX by default, but packages exist around the web for installation, if needed, and the command works as shown. This is the most portable command I can find that lists listening ports and their associated pid.

Find the package that installed a command

Create the directoty recursively

Get all files of particular type (say, PDF) listed on some wegpage (say,
This example command fetches '' webpage and then fetches+saves all PDF files listed (linked to) on that webpage. [*Note: of course there are no PDFs on This is just an example]

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Stop Flash from tracking everything you do.
Brute force way to block all LSO cookies on a Linux system with the non-free Flash browser plugin. Works just fine for my needs. Enjoy.

Cut/Copy brackets or parentheses on vim (in normal mode)
We have for example : func () { echo FOO echo BAR } Place the cursor under a bracket and press d + %. It will cut everything inside and the brackets. It let : func () You can copy text with y + %

Add fade in/out to first & last 25 frames of a video
Replace vid.mp4 with the path to your original video file, and out.mp4 to the path where you want to save the new file. To view the output first before saving, remove "-consumer avformat:out.mp4" from the end. Documentation for mlt framework and melt command can be found here:

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.


Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: