2/18/2024 0 Comments Tar compress into multiple filesTwo common options used with all three of these operations are ‘-f’ and ‘-v’: to specify the name of the archive file, use ‘-f’ followed by the file name use the ‘-v’ (“verbose”) option to have tar output the names of files as they are processed. This tutorial shows how to use tar to create an archive, list the contents of an archive, and extract the files from an archive. Archives made with tar are normally called “tar files,” “tar archives,” or-since all the archived files are rolled into one-“tarballs.” We can use the tar tool to create, list, and extract files from archives. This single file can be easily compressed for ease of transfer while the files in the archive retain the structure and permissions of the original files. Likewise, archives are used for software application packaging. Archive files are typically used for a transfer (locally or over the internet) or make a backup copy of a collection of files and directories which allow you to work with only one file (if compressed, it has a lower size than the sum of all files within it) instead of many. Sudo dd if=/dev/sdf1 bs=1GB skip=150 count=40 | gzip -c > img2.How can you create and manage Linux archive files? In a nutshell, an archive is a single file that contains a collection of other files and/or directories. Sudo dd if=/dev/sdf1 bs=1GB count=150 | gzip -c > img1.gz If you wanted to do 150GB on your first one and 40 on your second, you might do: To operate on the second chunk, just add a skip=XXX bit to your second dd invocation, where 'XXX' is equal to the count= value you gave it the first time. This will enhance gzip's ability to compress the free space in the disk image. If you have read-write access to the original filesystem, it would be worth filling up the free space with a file written from /dev/zero to zero out the unused space before saving it with dd. It's hard to say how well it will compress, but it should be smaller than the original filesystem. If you are set on operating on the partition with a non-filesystem aware program, then using your dd line (as modified above to be correct) will likely work. Options include tar, or you might want to look into something like Clonezilla, Partclone, Partimage, or for a more Windows-specific option to directly access a Windows filesystem, Linux-NTFS (note the previously mentioned tools can handle Windows filesystems to various degrees, too). Particularly if the source filesystem isn't full. Are you using dd here because the filesystem is corrupted/damaged/etc and you need a bit-for-bit exact disk image copy of it? Or are you just trying to get the data off? A filesystem-aware tool might be more effective. However, before you do that, a couple of other questions. ![]() Also, to have gzip send its output to standard out, you need to pass it the -c option. You could then pick up where you left off by adding a skip=150 to skip 150 blocks (each of 1GB) on your second run. ![]() So if you want 150GB, you might do bs=1GB count=150. ![]() It looks like you're trying to hit 150GB, but you need to factor in both the block size and the count (count is the number of blocks of block size). First, the command you listed probably won't work as you're expecting. ![]() It has the ability to break up files into multiple volumes.Ī couple of things here.
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