Journal of my recent activities

Downloading backups from remote hosts

rsync -a --progress --delete -e 'ssh -p 223' user@host:/dir1 local_dir

- v verbose

#soft #linux

Symetric ant anti-symetric wave function

Google Sheets: Bulk delete

Tools > Script ediotr Set a breakpoint at console log sheet name and Debug.

function DeleteAllSheets() {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  console.log("Doc: " + ss.getName());
  var sheets = ss.getSheets();
  for (i = 0; i < sheets.length; i++) {
    switch(sheets[i].getSheetName()) {
      case "21-01":  
        console.log("Delete: " + sheets[i].getSheetName());


Convert ssh2 public key to openssh format

If the pub key is in the format


then you can convert it with

ssh-keygen -i -f >> ~/.ssh/authorized_keys

#soft #linux

Backup SD Card in Fedora

  1. Insert card
  2. Check the /dev label (fdisk -l; lsblk, df)
  3. Unmount: umount /dev/sdb1 (do not use Nautilius eject button)
  4. Backup: dd bs=4M if=/dev/sdb of=nextcloud210313.img

Update pip packages

(venv) $ pip list --outdated
(venv) $ pip list --outdated --format=freeze \
               | grep -v '^\-e' | cut -d = -f 1  \
               | xargs -n1 pip install -U

How to upgrade all Python packages with pip #python #soft

$ systemctl list-timers
$ systemctl enable --now ibm_backend.timer

in user space use --user parameter, and put your timers into ~/.config/systemd/user/

Use systemd timers instead of cronjobs

certbot timer

OnCalendar format

#linux #cron #crontab

Photomultiplier tubes are extremely sensitive detectors of light

1 photon > cathode> 1 electron >> ... > n*electron >> ... > anode