Hpux find tar gzip


 
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Operating Systems HP-UX Hpux find tar gzip
# 8  
Old 08-05-2016
Does the tar without gzip contain anything?
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# 9  
Old 08-05-2016
Code:
find * -type f -mtime -$nb_days -print | xargs tar cf - | gzip > $MAITUT/BCK_DATA.tar.gz

Maybe the following works as well (and handles special characters in filenames better)
Code:
find * -type f -mtime -$nb_days -exec tar cf - {} + | gzip > $MAITUT/BCK_DATA.tar.gz

Both methods will fail if there are too many files: a second tar is invoked that certainly obscures the tar file.
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# 10  
Old 08-08-2016
These options will struggle with too many filenames because xargs will produce multiple commands from the list. The command xargs (as I understand it) will take the input list and try to make a single command line from the options given using the input as described or as the final part of the line by default. If the line is going to exceed the maximum command length, then xargs will loop on the command with the remaining input.

With a tar this could be disastrous because the potential multiple tar commands would not be able to be disentangled if you needed to read it back.

If this was AIX, I would recommend writing the names of the required items into a temporary file and passing that with the -L flag, but I'm not sure that HP-UX or anything else supports that. Solaris might use -I (capital i) instead. You would have to read the manual page and look for a flag to accept a list or input file.


Could you consider cpio or other tools instead?


Robin
This User Gave Thanks to rbatte1 For This Post:
# 11  
Old 08-08-2016
hello
you can use this code:

Code:
find * -type f -mtime -$nb_days -print -exec tar cvf {} \; && bzip2 *.tar




Moderator's Comments:
Mod Comment Please use CODE tags as required by forum rules!

Last edited by RudiC; 08-08-2016 at 07:41 AM.. Reason: Added CODE tags.
This User Gave Thanks to rezasadeghi For This Post:
# 12  
Old 08-08-2016
Looking at Rudi's
Code:
find * -type f -mtime -$nb_days -print | xargs tar cf - | gzip > $MAITUT/BCK_DATA.tar.gz

I would say xarg is useless and will give you trouble and is maybe what is upsetinf you from the beginning
Im quite sure
Code:
find * -type f -mtime -$nb_days -print |  tar -cvf - | gzip > $MAITUT/BCK_DATA.tar.gz

should work but I have no HP-UX or any unix to give try at the moment...
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# 13  
Old 08-08-2016
Hmmm - isn't it that tar expects the files to create an archive from on the command line? Doesn't it use stdin only when extracting from a data stream?

So xargs WOULD be needed to supply the file names coming from find on stdin as parameters on the command line to tar.

Above proposal yields
Code:
tar: no files or directories specified

on FreeBSD, and
Code:
tar: Cowardly refusing to create an empty archive

on my linux machine.
This User Gave Thanks to RudiC For This Post:
# 14  
Old 08-08-2016
tar: Under linux you can use -T - to read filenames from stdin.

Pack:
Code:
find /path -type f | tar -T - -cf - | gzip >file.tar.gz

Unpack:
Code:
gzip -dc file.tar.gz | tar -xf -

I doubt that HP-UX tar already has this option. But maybe. I recommend cpio as the better option here too, because it's designed right from start to work with files from stdin.

Quote:
Originally Posted by royinfo.alain
I tried with the f and have no errors..

the command that I used :
Code:

find * -type f -mtime -365 -print | xargs tar -cvf | gzip > $MAITUT/BCK_DATA.tar.gz
tar -cvf has not argument for -f. What was recommended to you is this command(dash at the end): tar -cvf -

Last edited by stomp; 08-08-2016 at 10:00 AM..
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