df (disk filesystem) #  rm -r mydir (Remove Full Directory)  
 du   (Disk Usage)  
lsblk  
       
       
  grep -Ril "text-to-find-here" /
    • i stands for ignore case (optional in your case).
    • R stands for recursive.
    • l stands for "show the file name, not the result itself".
    • / stands for starting at the root of your machine.
 
       
 
#  update-alternatives --config editor select a editor you want  
 Ping with timestamp #  ping www.google.com | while read pong; do echo "$(date): $pong"; done    
       
Das ganze System in allen Dateien nach einem bestimmten String durchsuchen #  find . -type f -exec grep -il "String" {} \;