Bookmarks for Ubuntu / Linux

• User & Groups: https://wiki.ubuntuusers.de/Benutzer_und_Gruppen/
  Command id returns uid und gui of a user
• Change the UID and GID of a user/group: https://www.thegeekdiary.com/how-to-correctly-change-the-uid-and-gid-of-a-user-group-in-linux/
• How to Install and Configure an NFS Server on Ubuntu: https://www.tecmint.com/install-nfs-server-on-ubuntu/
• How to Enable SSH on Ubuntu: https://linuxize.com/post/how-to-enable-ssh-on-ubuntu-20-04/
  Enable password authentication: https://askubuntu.com/questions/1450980/enable-ssh-login-with-password-for-a-user
  Note: Newer versions of openssh-server allows creation of /etc/ssh/sshd_config.d/*.conf files rather than editing the “/etc/ssh/sshd_config` file.
• Howto mount USB drive in Linux: https://devconnected.com/how-to-mount-and-unmount-drives-on-linux/
• Setting up ftp server: https://documentation.ubuntu.com/server/how-to/networking/ftp/

Reducing the size of a PDF document via command line:

ps2pdf -dPDFSETTINGS=/ebook input.pdf output.pdf

A 17.4 MB file was reduced to 1.7 MB