As you can see i can tar all the files. But when i gave the gzip command, i am getting an error in it. The following is the command and its error.
Code:
acidmmm:gzip 07272009.tar
gzip: 07272009.tar.gz: No space left on device
Is there any limit on size of the file.. If so, Please advise me on how to take it forward. I just want to archive these files in as much less memory i can.
The - in tar means (with the c option) write to standard output (or read from standard input with the x option).
The -9 means maximum compression (9) (you can use -c also, which means read from standard input with gzip, and write to standard output with gunzip, but it seems most gzips are happy without it)
It's all explained in the man pages.
----
Sorry I didn't explain it very well (or at all!).
Code:
tar cvf - files_or_directories
Will tar up the files or directories you specify and write the tarfile to standard output.
Code:
| gzip -9
will pipe the output (the tar file) into gzip and compress it (using maximum compression, -9) and write this to standard output (as it doesn't have either an input or output filename to work with)
Code:
> myfile.tar.gz
will direct standard output (your compressed tar archive) to myfile.tar.gz.
You can do the reverse also:
Code:
gunzip -c myfile.tar.gz | tar xvf -
This is quicker and saves diskspace in the short term. You can do similar things with pipes, such as when exporting large database schemas directly to compressed files, etc, if you don't have enough space for the .dmp file.
In fact, you can set up just about anything to write directly to a compressed file.
i.e.
Code:
mknod myLogFile.txt p
cat myLogFile.txt | gzip -9 > myLogFile.txt.gz &
(run your program or script that writes to myLogFile.txt)
The background process "cat .... &" will end when your program or script does
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