Linux quick reference for Debian/Ubuntu/Raspbian

linux.txt

Create directory (only one level can be created, upper levels must exist)
$ mkdir /path/to/directory

Create nested directories
$ mkdir -p /path/to/directory

Open/edit/create file with nano editor
$ sudo nano "/var/www/example.com/public_html/f24434ecdfc7.html"

Move folder
$ sudo mv "/SEAGATE1/Kerem/Downloads/WebTools.bundle" "/var/lib/plexmediaserver/Library/Application Support/Plex Media Server/Plug-ins"

List files with permission info
$ ls -l

Change user and group ownership of folder recursively
$ chown -R ownername:groupname foldername

Remove or delete a file
$ rm abc.txt

Remove the folder with all its contents(including all interior folders): 
$ rm -rf /path/to/directory

Remove all the contents of the folder(including all interior folders) but not the folder itself: 
$ rm -rf /path/to/directory/*

List services  
$ systemctl | grep service  

Stop service  
$ systemctl stop apache2  

Start service  
$ systemctl start apache2  

Reboot
$ sudo reboot

Shutdown and power off
$ sudo shutdown -P now

See last 10 entries in system log
$ sudo tail /var/log/syslog

See last 100 entries in system log
$ sudo tail -n100 /var/log/syslog

See last 100 entries apache web server log
$ sudo tail -n100 /var/log/apache2/access.log

Running processes
$ ps -o pid,sess,cmd afx | egrep -A20 "( |/)cron( -f)?$"

Kill proces
$ kill -9 <PID>