Comments on: Linux commands I never knew existed: Pipe Viewer

By: Arun

Arun — Wed, 07 Dec 2011 10:34:02 +0000

Hi,

I would like to copy one file from my computer to another. Both are linux and I need the log file showing the time taken to copy the file. Please help me asap.

Thanks,

By: single watch winder

single watch winder — Tue, 22 Nov 2011 12:00:11 +0000

single watch winder…

[...]Linux commands I never knew existed: Pipe Viewer | Slashzerø[...]…

By: abx21

abx21 — Thu, 07 Aug 2008 20:38:56 +0000

Yeah, I just used an example command and didn’t put a lot of thought into it, frankly I didn’t really expect anyone would ever see it, I will try and put more effort into the next entry.

Thanks!

By: F. Hauri

F. Hauri — Thu, 07 Aug 2008 16:27:05 +0000

It’s a wrong syntax:

$ cat toto | cat tata | gzip > titi.gz

give the same result than
$ gzip < tata > titi.gz

“cat toto” will simply be ignored.

for doing what you expect, you need to do something like:
$ cd /home
$ size=`du -bs user | sed s/[[:space:]].*$//g`
$ tar cpf – user | pv -s $size | gzip > /tmp/backup.tar.gz
366MB 0:00:33 [ 11MB/s] [=================================>] 100%

And you will maybe get a “not so high” rate…

By: F. Hauri

F. Hauri — Thu, 07 Aug 2008 16:26:08 +0000

It’s a wrong syntax:

$ cat toto | cat tata | gzip > titi.gz

give the same result than
$ gzip < tata > titi.gz

“cat toto” will simply be ignored.

for doing what you expect, you need to do something like:
$ cd /home
$ size=`du -bs user | sed s/[[:space:]].*$//g`
$ tar zcf – user | pv -s $size | gzip > /tmp/backup.tar.gz
366MB 0:00:33 [ 11MB/s] [=================================>] 100%

And you will maybe get a “not so high” rate…

By: F. Hauri

F. Hauri — Thu, 07 Aug 2008 16:25:14 +0000

It’s a wrong syntax:

$ cat toto | cat tata | gzip > titi.gz

give the same result than
$ gzip titi.gz

“cat toto” will simply be ignored.

And you will maybe get a “not so high” rate…

By: Han

Han — Thu, 07 Aug 2008 09:42:38 +0000

Not sure why, but it seems I need to use “tar cf – user |pv |/bin/gzip > backup.tar.gz” to get it work on Ubuntu 8.04 64-bit.

By: Frank

Frank — Thu, 07 Aug 2008 02:32:10 +0000

That was my point Subie. He’s GZiping the file twice.

By: Woody

Woody — Thu, 07 Aug 2008 01:38:17 +0000

While pv certainly has uses, sending a USR1 signal to dd will cause it to dump a progress report including rate like so:

18335302+0 records in 18335302+0 records out 9387674624 bytes (9.4 GB) copied, 34.6279 seconds, 271 MB/s

By: joe

joe — Thu, 07 Aug 2008 00:49:18 +0000

Thanks! I’d never heard of it, and could use something like that!