Commands by pqatsi (8)

  • QEMU From Fedora Livecd + Device CD + Device Disk + UEFI + 800x600 forced

    Entire command: sudo qemu-system-x86_64 -enable-kvm -cpu host -M q35 -m 2G -smp 4 --bios /usr/share/edk2/ovmf/OVMF_CODE.fd -drive id=cdrom,file=/dev/sr1,if=none,media=cdrom,format=raw,readonly=on -drive id=disk,file=/dev/md126,if=none,format=raw -device virtio-blk-pci,drive=cdrom -device virtio-blk-pci,drive=disk -device VGA,vgamem_mb=64,xres=800,yres=600


    -2
    sudo qemu-system-x86_64 ...
    pqatsi · 2022-09-02 20:07:02 543
  • Before any Dell Firmware update on Ubuntu, run

    After install https://linux.dell.com/repo/community/openmanage/ (Complete, all), install these packages or you will get segfaults on update and it will fail.


    0
    apt install raidcfg dtk-scripts syscfg smbios-utils sfcb cim-schema dcism
    pqatsi · 2020-05-29 06:49:23 166
  • Update ESXi

    Update method: 1) Find you current version and release in https://esxi-patches.v-front.de/ESXi-6.5.0.html (You can copy the Build number and Control+F in the page). 2) Run this command release per release, changing the with the name of Imageprofile. As example: esxcli software profile update -d https://hostupdate.vmware.com/software/VUM/PRODUCTION[168/1029] depot-index.xml -p ESXi-6.5.0-20180304001-standard This way is needed because updates arent cumulative, so need to do one by one. Show Sample Output


    0
    esxcli software profile update -d https://hostupdate.vmware.com/software/VUM/PRODUCTION[168/1029] depot-index.xml -p <Release>
    pqatsi · 2018-04-03 13:26:58 281
  • dmesg pipe less with color


    0
    dmesg -L=always | less -r
    pqatsi · 2018-01-19 13:04:43 21
  • A good way to write to SDCard


    0
    dd if=<image> of=/dev/sdx bs=4M iflag=direct,fullblock oflag=direct status=progress
    pqatsi · 2018-01-08 00:42:10 24
  • Show public IPv4 and IPv6


    0
    echo "IPv4: $(curl -s4 ip.appspot.com)" ; echo "IPv6: $(curl -s6 ip.appspot.com)"
    pqatsi · 2017-12-26 12:52:38 19
  • Shell to discover MTU using ping

    Changelog: Changing ping to "ping -A -c1 -w10" - targeting a quick and reliable ping, even on slow networks.


    0
    ADDR=127.0.0.1 ; for i in `seq 1300 1501`; do echo -ne "Pacote de tamanho $i bytes" ; ping -A -c1 -w10 -s $i -Mdo $ADDR 2>&1 > /dev/null || break ; echo -ne "\r\033[2K" ; done ; echo -ne "\r\033[2K" ; echo -e "MTU bem sucedido com `expr $i`"
    pqatsi · 2015-12-18 18:11:47 11
  • aria2c to speedtest connection

    Tests connection speed over HTTP request. Can use a lot of http mirrors of SAME file (Useful for test with Ubuntu mirrors, as example) and the split will be done opening connections in all urls if possible. -s Split connections in N number MAX=16 -j Set max concurrent downloads, must be equal to -s or will be restricted to this number. -x Set max connection per server, recommended to be the same of split. -k Min Split Size, default is 20MB, usefull to really force more splited connections over same file -d Directory to save the "file", in this case, /dev -o Points output to null --file-allocation=none Do not attempt to prealocate the file. --allow-overwrite=true Overwrite to /dev/null. Recommend use "rm /dev/null.aria2" after if runned as root. Show Sample Output


    0
    aria2c -s16 -j16 -x16 -k1M -d /dev -o null --file-allocation=none --allow-overwrite=true <url>
    pqatsi · 2015-06-18 13:13:12 9

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Count files beneath current directory (including subfolders)

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Super Speedy Hexadecimal or Octal Calculations and Conversions to Decimal.
^Hexadecimal Ten minus Octal Ten is Eight(in Decimal). $ echo "$(( 0xaf )) = $(( 0257 ))" ^Hexadecimal AF and Octal 257 are both Decimal 175.

Apply an xdelta patch to a file
xdelta is a command line program for delta encoding, which generates the difference between two files. This is similar to diff and patch, but it is targeted for binary files and does not generate human readable output. http://xdelta.org/

Recursively chmod all dirs to 755 and all files to 644

Display the history and optionally grep
Place this in your .bash_profile and you can use it two different ways. If you issue 'h' on its own, then it acts like the history command. If you issue: $ h cd Then it will display all the history with the word 'cd'

Chmod all directories (excluding files)
+ at the end means that many filenames will be passed to every chmod call, thus making it faster. And find own {} makes sure that it will work with spaces and other characters in filenames.

Launch a game, like Tetris, when apt-get installing an app larger than 50 Megabytes
Change the APP variable's value to whatever you want to install. Depending on how fast your machine is, you'll want to adjust the value 50 to something else. You might also want to play a different game than Gnometris - just make sure it's a GUI game.

Increase SCT of external USB disk enclosure to one hour.
So I had this 2TB Seagate external disk/USB enclosure which by default would spin-down its internal drive (it enters a standby mode) after four minutes of inactivity.. Spinning-up the inactive drive was an annoying delay when accessing files and also it severely interfered with NFS.. SCT stands for "Standby Condition Timer". To completely disable SCT: $ sdparm --clear STANDBY -6 /dev/sdb To return to original (default) SCT settings: $ sdparm -D -p 0x1a -6 /dev/sdb To verify the settings (before and after): $ sdparm -a /dev/sdb No need for vendor-provided MSWIN tools, etc.

Print the current time on the whole screen, updated every second
http://www.joachim-breitner.de/projects#screen-message now also supports reading stdin continuously to update what it shows, different ?slides? separated by a form feed character. Here, we feed the current time into it each second to create a large clock.

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