Unmount the ramdisk's filesystem: sudo umount.Run mkdir /mnt/tmpfs/tmp & 7z x -o/mnt/tmpfs/tmp & tar cf archive.tar /mnt/tmpfs/tmp & rm -rf /mnt/tmpfs/tmp * = path to the source.Mount the ramdisk's filesystem: sudo mount -t tmpfs -o size= tmpfs /mnt/ramdisk * = size of the filesystem in bytes * 10 3 (1, 1K, 1M, 1G.Create the mount point for the ramdisk's filesystem: sudo mkdir /mnt/tmpfs.Anyway it's very easy to automate everything in a single command: mkdir tmp & 7z x -otmp & tar cf archive.tar tmp & rm -rf tmpĪlso the time required for the source archive's files to be written to the disk and for the extracted files to be read in order to / extract / rearchive the source archive in two steps is a bottleneck for the whole task mostly (altough not only) because of a potential disk's low I/O speed, so a partial solution would be to store the temporary files to a ramdisk in order to almost void the overall bottleneck:

That being said, If you meant to / extract / rearchive the source archive at once, the answer is you can't, at least not using Ubuntu's default tools because tar can't read from stdin, so you can't pipe 7z and tar.

7z archive wouldn't use any compression it would still require an extraction. They differ in their scope, and in most cases a conversion would require an optional decompression always followed by an extraction of the source archive. 7z archives are archives often compressed with some kind of algorithm, while.

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