7/29/2023 0 Comments Linux unzip .xz![]() With two consecutive buffers, the pipe could keep downloading and extracting for a while in the background.īut without a buffer, the whole pipe would immediately slow down at once, and would rarely ever reach full speed again. Even if it didn't, without a buffer the whole pipe is sensitive to slowdowns.įor example, when flashing directly from the internet, I found that some USB devices occasionally did a flush or something, and that causes a periodic slowdown. I'm pretty sure that a simple '>' would do it one bit at a time. ![]() What if you dont even use dd, just `wget. (and when you want to have the world's fastest img downloader, every second counts.)Īdditionally, in my script I go a couple steps further by loading the first 100MB of the img into cache first, and also it uses the buffer package to overcome I/O bottlenecks for maximum efficiency. It usually cut down on download time by around 3 seconds. In my tests, I found it gives a bit of a buffer. The cp command (which is very fast in my tests) uses just 128KB block size (see strace cp. ![]() ![]() Just for my interest, why are you using "bs=10M" for the dd command? Now I just use "cp" - its simple to use and fast enough in practice (slightly faster than dd bs=1m) In case you want to suppress these messages, then you can use the -q option. A summary of the extraction process is printed. By default, when we use the unzip command, the command prints list of all the files that are getting extracted. Suppress Output When Using Unzip in Linux. I gave up trying to calculate everything and produce an optimal C program! This command will unzip all the individual zip files. So, given that the disk read times are near zero for this case only, whats the best read/write block size to give dd for the optimal overlap between reads and writes? įor example, I usually download the image to a memory disk, then uncompress it and copy it to the raw device. Given all the above variables, any simple benchmark results will be meaningless. Its incredibly complicated given: different read/download speeds, decompression speeds, indeterminate overlap between reads and writes, disk write speeds, variable asynchronous disk block prefetch ranges, "sync" time, verification time, etc etc Finally Documents is the directory to archive and compress.Believe it or not, with enough optimization, it can be faster to download an img, extract it, and flash it to a SD card, than to flash a local, pre-extracted. tgz file extension, others will know that this is a tar archive that has been gzipped. The new archive must be named, which is Documents.tgz in this example. The -czvf options break down as c for create a new archive, z for compress with g zip, v for verbose output, and f for file equals archive, which means the archive maintains the file structure of the original directory. Zip Files in Linux Terminal With Tar and GzipĮnter the command tar -czvf Documents.tgz Documents. Using tar with the gzip option on the directory compresses everything and makes one archive. Using the other zip methods on a directory of files, you’d get a compressed archive for each file in the directory. You get a nicely compressed single package of files. Whatever the file sizes are, the size of the tar file will be about the same.īut if you combine a zip method with tar, then you get something really cool. Why hasn’t tar been mentioned yet? It’s an archiving tool, taking a bunch of files and putting them into one archive for easy transport. What About Tar to Zip and Unzip Files in Linux?
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